Harbone

So you sold it to him a few years back but have not heard from him in over a year? Was he trying to arrange shipping in that gap between paying and when you last spoke to him?
If you got paid and he has not picked it up in that long of time then its hard to say what you can do legally? Do you still have the title and did you ever send him an actual bill of sale?
You may want to contact a lawyer before making any decision that may come back to haunt you at a later date.