That's pretty much the opposite of what I've heard from other sources. Namely that Amazon co-mingles stock supplied to them by third party vendors with the stock they purchase themselves from manufacturers and distributors. If you are correct, it would certainly lessen the risk of getting a fake from them, although there would still be the potential buy/switch/return issue. I buy a lot of stuff from Amazon, but knives are one thing I will not.
And yet, the OP does not trust them, or this thread would not exist.