Isn’t this going to be true of any “pure” retailer? The nature of FBA and third-party sellers just means there will always be at least some percentage of fraud and so on that’s higher than “trick various people in the retailer to sell fake goods”.
Particularly as it’s much easier for insiders at a retailer to steal from their employer (and then resell via whatever means), I think the utility for “put fake goods on the shelf” at a retail shop is basically zero. I dunno, maybe you can trick/bribe the person near the start of the supply chain, but it wouldn’t take long for returns to pile up and an investigation to find “Jim and Sally colluded to sell fake gym shorts”.