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runscott...unless it's someone you know and trust. Scott Gaynor does these occasionally (or used to) and his were apparently used for high-end stuff, to simulate a real auction - I have no problem at all bidding on Scott's private auctions. In fact, I think Scott's use of private auctions is probably how ebay intended for them to be used, not as a means of hiding shill bids and keeping novices in the dark.
As far as telling a fake from a scan, I can almost always spot a fake t206 from an ebay scan, and t205's normally look like DrBond's Matty, so those should be easy to spot as well. His Cobb; however, is much more real-looking. I don't collect t205's, so I'll leave it to others to describe what to look for - I'm sure there are those on this board who think the t205 Cobb is a terrible forgery, I'm just not that good at it.
I also suggest that if you have a card in mind that you would like to bid on or purchase, and you have doubts, contact someone on the board that knows that particular issue - most people don't mind answering questions. I get questions all the time and my rule of thumb is simple: if it looks questionable, either ask for a clearer scan or don't bid. Quite seriously, 9 out of 10 times I get an equally crumby scan or a "broken printer" excuse when I ask for a clearer scan.