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How to Build a Long Term Strategy to Prevent Unauthorized Sellers on Amazon: Part 1

By Zac Garthe
Zac Garthe is an intellectual property attorney, brand protection expert, and CEO of Sigil. With over a decade of experience in global brand enforcement, he has helped brands from startups to Fortune 500 companies protect their intellectual property and marketplace presence. He frequently speaks at industry conferences and webinars about brand protection strategies.
TABLE OF CONTENTS

Overview

For brands operating on Amazon, the battle against unauthorized sellers can feel like a frustrating game of “whack-a-mole.” Unauthorized sellers are identified, reported, and disappear, only to have two more pop up the following day. This reactive, manual approach is unsustainable, and leads to significant financial and reputational damage. If brands want to continue to sell on Amazon, they must recognize that temporary fixes are no match for systemic problems. 

In Part 1 of this series we’ll break down: 

  • The difference between counterfeiters and unauthorized sellers
  • Why unauthorized sellers are often more dangerous 
  • The hidden damage they cause to pricing, customer perception, and channel integrity
  • Why brands need more than temporary fixes

Let’s dive in. 

Defining the Threat

To build an effective defense, it’s essential to understand the difference between the primary threats: counterfeiters, and unauthorized sellers. Counterfeiters represent intellectual property (IP) infringement, creating fake versions of your product and listing them as genuine. Their listings typically involve: 

  • Fake or low-quality goods
  • Stolen images or text
  • Customer safety risks

While counterfeiters are serious, Amazon has a straightforward process for dealing with them. 

Unauthorized Sellers, conversely, are typically dealing in authentic product acquired through unauthorized channels, leading to Minimum Advertised Price (MAP) violations and chaos on your listings. They tend to acquire product through: 

  • Leaky wholesale channels
  • Liquidators
  • Diversion from international markets
  • Sub-distributors operating outside your agreements.

Unlike counterfeiters, unauthorized sellers comply just enough with Amazon’s policies to stay active, making their removal far more difficult. Both types of bad actors steal sales and degrade brand control, but they require different enforcement tactics.

The Damage Beyond Sales

The true cost of allowing unauthorized sellers to run amok extends far beyond a momentary loss of the Buy Box. Here are the main areas where unauthorized sellers quietly erode brand value: 

  1. Price Erosion and MAP Collapse – unauthorized sellers will not follow your pricing strategy. Their goal is rapid liquidation, not protecting your brand. This leads to:
    • Undercutting authorized partners
    • MAP violations that are nearly impossible to reverse
    • A race to the bottom that permanently damaged perceived value

Once your price collapses on Amazon, it spread to Walmart, Target, Google Shopping, and beyond. Rebuilding price integrity can take years

  1. Listing Chaos and Customer Confusion – multiple sellers listing multiple versions of a product creates:
    • Buy Box instability 
    • Inconsistent shipping times 
    • Competing offering with unclear quality 
    • Confusion about where the product truly comes from 

This is not the ideal customer experience, and they will associate it with your brand, not the seller. 

  1. Negative Review that Hurt your Brand – when unauthorized sellers ship old stock, expired items, or products without a valid warranty, customers respond negatively. Most often we hear:
    • “Box was damaged and arrived late”
    • “No warranty paperwork included, and the brand will not honor a replacement”
    • “Came missing pieces”

But these reviews go under your listing, dragging down your conversion rate, reputation, and Amazon search ranking. These combined effects tarnishes brand equity that took years to build. 

Why Quick Fixes Don’t Work

Relying only on RAV reports, Cease & Desists, and occasional test buys will never solve the problem permanently. While such efforts may create temporary relief, they rarely are able to eliminate unauthorized sellers for good. The real drivers of the problem are deeper: poor supply-chain visibility, weak or outdated reseller agreements, the absence of warranty-based trademark differentiation, and inconsistent monitoring and enforcement. When these foundational issues remain unaddressed, brands stay trapped in constant reaction mode instead of regaining control. 

Where Sigil Fits Into This Problem

At Sigil, we help brands regain control of their Amazon presence by giving them the visibility and data they need to respond to unauthorized sellers. Instead of manually checking listings each day, Sigil surfaces crucial insights: Buy Box changes, unauthorized seller activity, pricing violations, seller storefront patterns, and historical tracking that strengthens your enforcement. If you’re ready to act decisively instead of reactively, connect with Sigil today. 

Next Up: Part 2 – The Prevention and Detection Framework

In part 2 of this series, we’ll walk through how to build a proactive defense that makes unauthorized selling unprofitable, risky, and difficult.

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