Here is the bidding history of an auction-only item I sold a few months back. Anyone looking at this history might suspect shill bidding but I know for a fact that this was not the case (since it was my item.)

I had received several offers to buy the item before the auction closed but politely turned them down. One person was very, very aggressive that I take his offer. After I turned him down the final time, all of a sudden I see the flurry of bids from two brand new accounts as shown above. Since this item was time sensitive, my fear was that these were revenge bids (revenge bidder would not pay, and dated item would expire). Luckily there was enough time for me to block these two bidders and the item went to a good eBayer.
But I can say for sure that there was no shill bidding even though the history appears fishy.
Don