Is this someone's screen name followed by "(private)" on eBay? If so, that apparently means they have chosen to keep their feedback private. Something similar just happened to me on an auction I won this morning. It was bid up in small increments by such a person. When I checked that person's feedback statistics (they won't provide any details on specific feedback or from whom), it appears that out of 72 feedbacks he's received, they have all been from 2 members. A search of his recent bidding shows that he only is bidding on items from 2 sellers (both of who just happen to be located in Miami). I'm wondering if he is a shill bidder.