It's probably best to bid directly at the auction site (if possible), but until you receive a confirmation email, you still don't know if your bids were accepted. In this circumstance, I received the Sixbid confirmation, but not one from the auction house. I think the auction house just forgot to enter my bids, even though they seemed to be blaming Sixbid. I have bid through Sixbid and Numisbids dozens and dozens of times and this was the first time my bids were not put in, but I am a bit apprehensive now also.