[Someone1234]

I've ordered from Amazon (shipped and sold by) and received fake goods with another vendor's stickers on them (essentially a barcode swap).

If that was once accurate, I don't believe it remains accurate.

[AnssiH]

Commingling only happens when there is no seller barcode sticker ("stickerless inventory" in Amazon's terms).

So I believe in your case something else must have happened.