I mean…Sold amd shipped by Amazon is still a thing.
But even they sell counterfeited items.

So the only way to get a 100% genuine item is through the manufacturer (e.g. Samsung and storage media) or hope and pray you don’t get a scam product/test it after receiving.

Honestly: Aliexpress at times feels more genuine than Amazon. If it wasnt for the 20 stores by the same authenticated seller (the seller page is more obscured than on Amazon)