Well according to ebay.. they can not disclose any information concerning another ebayer for protection and security purposes. So he was a bit vague.. I have no real explanation as to HOW he did this..
but what happens is he closes an auction for you so that he can get the item for the price he asks for. The seller will rpobably question what happened and contact ebay. and they won't be able to tell you anything because he probably has a way of getting around it all without getting detected. So the sellers are basically left with no choice but to complete the transaction or to go through the trouble of relisting without getting any of your fees back and receiving negative feedback.
You can check his feedback you will notice a pattern of all the auctions he has won were ended early.
I am going to try to email some of those buyers and see if I can actually get in touch with them to see what happened to them. However I have a feeling the eBay representative finally noticed somethign weird because at that exact time I received a reply from the buyer asking why I was refunding him his money and that he thought he won the auction.
I have no idea how this hapened but the ebay representative was very serious and told me to block him, never communicate with him ever again and to go ahead and relist the item. They are investigating the case.. I amg oing to call back in a few days and see if there were any updates on it.
Sorry I can't be any help in answering your question. Because the ebay representative could not give any specifics concerning the other ebayer I have no detailed information on what happened.