uh oh

I just got an email from one of my buyers on eBay, saying that it's been several weeks since he bought the game from me, and if it doesn't come within another week he'll file a fraud complaint. But I shipped the game several weeks ago. It's certainly not here now, though I'll tear the room apart and check just to be sure, and I don't have any way of proving that I sent it. I never got in the habit of keeping receipts, since I pay for everything in cash. And even if I *had* the receipt from the UPS outlet, all it would say was that I made a purchase in the store on a certain day. It didn't include what the item was or even where it was sent to. They didn't give me a tracking number, either. So I'm pretty much screwed.