Comment by Natsu

I don't know if they still do it, but for the same SKUs, there were stories on HN about how they mingled the stock.

So you might get blamed for counterfeit goods sold by someone else if Amazon fulfilled an order with the 'same' goods provided by another seller instead of those actually provided by you.

I haven't heard that leading to any lawsuits like this, but it easily could be an issue in the future.