So they have various software methods of validating.
And they have tamper proof packaging.
I've still heard many a crypto bro recommend to only purchase directly from the manufacturer though.
I just went through the hassle, inconvenience and added expense of buying a trezor from trezor.io instead of Amazon.com.au, only to have the envelope arrive with a hand sized tear that was half taped back together. However the trezor box was still shrink-wrapped and has intact holographic stickers.
So I guess it is OK?
But what was the point of spending more?!
If you buy from the manufacturer's Amazon store, would Amazon ever send one from another seller?
Amazon has employees who could tamper, but seeing as they take orders into the toilet to try to keep up with the pace Amazon demands, they might not have time to tamper?!
I bought directly from amazon, had no issues. Just look for the one that had most review and says the seller as the same as manufacture. You shouldn't have any issues.