Ebay does have software to identify shill bidding and they will go after all participants. The fact that they are bidding on multiple items by the seller indicates the fraud. I thought you can no longer see the handles for bidders on other people's auctions, how do you know they are bidding on multiple listings?
I will add that I have had bidders message me right after a winning bid and say they bid on accident or overbid or something stupid like "my kid got into my account!", and so I always cancel the transaction right away and relist. There's no point trying to force these sales as they will just dispute it and you could lose the item and your money.
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