I had an auction end with one bid, and got this message after a couple of days: "Apologies, but could you please cancel the transaction. I found the issue in my local comic shop, and bought it figuring I would not win the auction because I was the first and only bidder so far. So sorry for any inconvenience."
You thought you wouldn't win because so far you're the only one that has shown interest? Anyway, I didn't respond to the message and I'd been debating whether to file a non-payment, or just let it go, and then the buyer ended up paying, without sending a follow up message. Odd