Any good Amazon seller knows to never commingle because it's really not worth the risk... Unless your brand/listing is gated and you are tightly controlling you

Any good Amazon seller knows to never commingle because it's really not worth the risk... Unless your brand/listing is gated and you are tightly controlling your supply chain and selling to only a few authorized resellers, you shouldn't commingle, otherwise you risk being suspended for someone else's mistakes or misdeeds. There are people who are lazy or cheap and don't want to pay the 10 cents to label their items with their Amazon sku. They take the risk. There are also other sellers who intentionally commingle because they sell grey-market items, things they did not buy through authorized sales channels, liquidations/fell off a truck stuff. On the other hand, in my experience, Amazon is actually fantastic at catching counterfeits because they are maniacal about positive customer experience and they do not care about sellers. They have bots and as soon as counterfeit/inauthentic/hazmat is triggered, they'll trace it back to the seller, and the seller will be investigated, caught, and potentially banned from selling on Amazon. Even if it's commingled, you can dig and find the bad actors, because everything is meticulously logged. Amazon errs on safety so they will shut down a seller from selling and hold their inventory hostage while they investigate, and their investigation can take weeks. Amazon is proactive, so many good sellers, even me, have some of our inventory frozen while Amazon goes through these checks. Amazon will ask for invoices, check them by following up with the company, and if they are not good enough for a Amazon's standards you will either be warned or banned. If you wanted to sell counterfeits on Amazon you will get caught, your account will be banned, and your IP addresses will be logged, and any time you try to open a new account, it will be automatically rejected if you reuse the same information - ip address, banking info, credit cards, physical address, legal entity. If you are not caught in the beginning but are caught later, you will be banned as well as any other accounts you might have simultaneously opened. What some companies consider counterfeit, Amazon probably considers as companies who can't manage their own business and lock down their supply chain.