I also see AMT 1.2T miners on ebay, I am not so sure if these are really "Fakes". Why would a guy with that many positive feedbacks be selling fake miners?
If you read closely, they are typically selling "pre-orders" The idea is that you buy their place in line to wait for the miner. Typically, they state that once you "win" the bid and pay, your relationship is with AMT rather than the ebay seller.
You have to read the detailed description well.