You can buy at all Auctionshouses a fake coin. No auction house can finde and eliminate 100% all of fakes. But at a serious Seller - you can come after 5 years, hey this is a fake because... and you get your money back. So buy at a serious auction hose or at a serious seller at VCoins / MA-Shop and you can sleep well. If you have questions about a Auctionhouse and you are not sure if it is - ask here in the forum - the users here will help you.