How to Conduct a Test Buy on Amazon (Brand Enforcement Guide)

2. Understand the Difference Between FBA and FBM Test Buys

Amazon sellers generally fulfill orders through two primary methods.

Fulfillment by Amazon (FBA): Sellers send inventory to Amazon’s fulfillment network, where Amazon stores, packs, and ships products to customers.

Fulfilled by Merchant (FBM): Sellers fulfill orders themselves or through third-party logistics providers.

This distinction affects the type of evidence brands can collect.

With FBM orders, the shipping label, return address, tracking information, and packaging may reveal clues about the seller’s warehouse or fulfillment operation.

For example, the return address might identify a logistics company, reseller business, or another organization involved in processing the shipment.

FBA orders typically provide less information about the seller’s operations.

The product may arrive in standardized Amazon packaging from an Amazon fulfillment center, with no documentation identifying the seller’s original supplier.

In these cases, the investigation relies more heavily on the physical product, its packaging, and manufacturer traceability records.

Neither fulfillment method guarantees that the inventory source will be identified, but understanding the difference helps brands establish realistic expectations.

3. Amazon Inventory Commingling: What Brands Should Know

Historically, Amazon’s inventory commingling practices created an additional complication for certain test-buy investigations.

Under eligible stickerless commingling arrangements, physically identical products from different sellers could be pooled within Amazon’s fulfillment network.

This meant that a customer purchasing from Seller A might receive a unit originally supplied to Amazon by Seller B.

For investigators, that distinction was important.

A serial number traced to a particular distributor did not necessarily establish that the selected seller had supplied that exact unit.

Amazon has since moved away from this model, ending its traditional commingling practice for affected FBA inventory as part of its 2026 inventory changes.

As a result, the historical concern about receiving another seller’s pooled inventory is no longer the same obstacle it once was.

However, brands should still verify the applicable fulfillment arrangement and maintain accurate purchase records.

A product purchased from a specific FBA seller can now provide stronger seller-specific traceability than under the previous commingling system.

That does not automatically establish how the seller acquired the inventory, but it improves the connection between the selected offer and the merchandise received.

4. Examine Shipping Labels and Return Addresses

For FBM orders, shipping information can provide valuable investigative clues.

Brands should examine the return address, shipping carrier, tracking history, and location where the package first entered the shipping network.

A seller registered in one state may ship products from a warehouse in another.

This could indicate a third-party logistics provider, a separate fulfillment location, or a dropshipping arrangement.

The return address may also identify a business that differs from the seller’s public Amazon storefront name.

Investigators can compare this information against the seller’s publicly available business details.

However, a shipping address alone does not prove that the business at that location owns the inventory.

Many sellers outsource fulfillment, and some warehouses process orders for numerous unrelated businesses.

For FBA shipments, Amazon’s fulfillment address generally provides little information about the seller’s original inventory source.

5. Look for Packaging and Dropshipping Clues

Packaging can reveal information that is not visible in the Amazon listing.

For example, an FBM order may arrive in a box associated with another retailer, distributor, or fulfillment provider.

This could indicate that the seller purchased the product through retail arbitrage or arranged for another business to ship the order.

Investigators should also examine invoices, packing slips, warehouse labels, and stickers included in the shipment.

These materials may contain supplier references, internal order numbers, or inventory identifiers.

The retail packaging itself can provide additional clues.

A product intended for European distribution may contain different language, regulatory markings, or SKU information than the authorized U.S. version.

Such differences may suggest parallel importation or another secondary distribution channel.

However, packaging differences alone do not establish counterfeiting or unlawful resale.

They should be evaluated alongside the manufacturer’s product and distribution records.

6. Trace Serial Numbers, Lot Numbers, and Manufacturing Dates

One of the most valuable aspects of an Amazon test buy is the opportunity to examine the actual product identifiers.

Manufacturers that maintain serial-number or lot-level tracking records may be able to connect the purchased product to an earlier distribution event.

For example, a serial number might identify the distributor that originally received the product.

If the merchandise was purchased from an unauthorized Amazon seller, that information provides a starting point for investigating how the product entered the secondary market.

Lot numbers can provide similar information for products tracked by manufacturing batch.

Manufacturing dates can also help determine whether the product belongs to current inventory, older stock, or a discontinued product generation.

Investigators should examine whether identifiers have been removed, altered, obscured, or replaced.

However, tracing a product to a distributor does not automatically establish that the distributor knowingly supplied the unauthorized seller.

Additional investigation may be necessary to identify downstream transactions.

7. Evaluate Product Condition and Authenticity

Amazon test buys can help brands determine whether sellers are accurately representing their products.

For example, a seller may advertise a product as new but deliver an item with damaged packaging, missing accessories, broken seals, or signs of previous use.

Other potential concerns include expired merchandise, counterfeit products, stolen inventory, or products intended for a different geographic market.

Investigators should compare the received product against the original Amazon listing and the manufacturer’s specifications.

For suspected counterfeit products, brands may examine security features, packaging characteristics, serial-number formats, and manufacturing details.

For product-condition investigations, the relevant evidence may include wear, missing components, or other characteristics inconsistent with the advertised condition.

A product’s age alone does not necessarily establish that it is used or defective.

Similarly, regional packaging differences do not automatically mean the product is counterfeit.

The findings should clearly distinguish confirmed violations from issues requiring additional investigation.

8. Use Test-Buy Evidence for Amazon Brand Registry Complaints

One advantage of conducting test buys on Amazon is that the findings may support complaints through Amazon’s brand protection and reporting systems.

However, brands should distinguish between intellectual property complaints and marketplace policy violations.

Intellectual Property Complaints

If a test buy confirms that a product is counterfeit or otherwise infringes applicable intellectual property rights, an eligible rights owner may be able to submit a complaint through Amazon Brand Registry‘s Report a Violation tools.

The complaint should identify the relevant intellectual property right and explain the evidence supporting the alleged infringement.

For example, a confirmed counterfeit product may support a trademark infringement complaint.

However, selling genuine merchandise without brand authorization does not automatically constitute trademark infringement.

Amazon Policy Violations

Other test-buy findings may involve Amazon’s product condition or marketplace policies rather than intellectual property rights.

Examples may include:

• Products advertised as new but delivered used or refurbished.
• Expired products sold in violation of applicable requirements.
• Merchandise that materially differs from the product description.
• Suspected stolen goods supported by appropriate ownership or theft evidence.

These issues should be reported through the appropriate Amazon policy-violation or support channel available to the brand.

A stolen-goods allegation, for example, should be supported by reliable evidence such as matching serial numbers and documented theft records—not merely suspicion.

Brands should not file an intellectual property complaint when the actual concern is a product-condition or marketplace policy violation.

Selecting the correct reporting category improves the accuracy and credibility of the complaint.

9. Preserve Evidence Before Filing a Complaint

A test buy should produce a clear record connecting the selected Amazon seller to the product received.

Brands should preserve the original listing, selected offer, order confirmation, seller identity, tracking history, and photographs of the merchandise.

For significant investigations, documenting the unboxing process can help establish the condition of the shipment upon arrival.

Any authenticity findings should be supported by the manufacturer’s records or appropriate technical evaluation.

If the investigation identifies a potential distribution source, the brand should document the evidence supporting that conclusion.

This is especially important when findings may lead to distributor inquiries, marketplace enforcement, or legal proceedings.

10. Determine Whether the Problem Is the Seller or the Supply Chain

A test buy may establish that an Amazon seller is offering counterfeit or misrepresented merchandise.

In other cases, it may confirm that the seller is offering genuine products acquired through secondary distribution.

These situations require different responses.

A counterfeit finding may support intellectual property enforcement.

A product-condition violation may support an Amazon policy complaint.

A genuine product traced to a distributor may instead require a supply-chain investigation.

For example, if an unauthorized seller repeatedly replenishes genuine inventory, removing one listing may not address the underlying source.

Brands may need to examine distributor sell-through records, downstream wholesale relationships, or liquidation activity.

The objective is to use the test-buy findings to identify the most effective next action.

Conclusion: Amazon Test Buys Connect Sellers to Physical Evidence

Amazon test buys allow brands to investigate unauthorized sellers beyond what is visible on the marketplace.

Purchasing from the correct seller is essential, particularly when multiple businesses compete on the same ASIN.

FBM orders may provide useful shipping and warehouse clues, while FBA orders generally require greater reliance on product identifiers and manufacturer records.

With Amazon’s traditional commingling model phased out, brands also have a stronger basis for connecting purchased FBA inventory to the selected seller.

At Brand Alignment, we use Amazon test buys as part of broader brand protection investigations to help brands verify products, investigate unauthorized distribution, and gather evidence for appropriate enforcement.

The most valuable Amazon test buy is one that answers a specific question: Is the seller violating marketplace rules, distributing counterfeit merchandise, or obtaining genuine products through a supply chain that the brand needs to investigate?