It depends when you sold it. I wouldn't necessarily expect a buyer to contact you when the auction is still running, not if an item was listed as pick up only. But after an auction ends then yes, I would expect contact. Firstly, I would contact them, just to try to sort out a pick up time. I wouldn't give address at that stage, just try to narrow a window for them to come and collect it.

If you have done all that and have had no response in eg a week or two, then you may be able to cancel the sale and refund the money to the buyer. I'd be inclined to do that, if I could.