[etataetaet]

Magic the Gathering cards come to mind! Buying MTG cards from Amazon can be a little risky as there is a non zero chance of getting a box with already opened packs [0]. Customers buy the product, take the valuable cards out, reseal it and return to Amazon. Amazon just throws it in with the rest as they doesn't know how to properly check for tampering.

[0] : https://www.reddit.com/r/magicTCG/comments/omj8jh/amazon_cus...

[tomnipotent]

This has nothing to do with Amazon or co-mingled inventory, and everything to do with shitty customers. Non-Amazon sellers would have the exact same issue. At least with Amazon, I have regress as a customer and know that things will be made right regardless of the circumstances of the sale.

There's plenty of ammo to use if you want to take potshots at Amazon, but this isn't one of them.