After approximately 44 hours of waiting for the payment to arrive, the guy who bought the iMac G4 has just told me he wants to cancel; he didn't notice that there was a crack in the screen surround, even though it's mentioned in the item description and there's a close-up picture of the crack.

Oh well, no harm done apart from my annoyance, and at least it's packed now so I will be able to send this easily when it does sell.

Since it turns out that the buyer (a) only joined eBay two days ago and (b) was based in China I'm feeling a little relieved.