This is a hard one. Unless you can read minds, I don't have an idea. Unless it is some one you know (hard to know everyone) or see if they sell stuff (serch their posts).
I try to take people at their word though. Someone gave me a beautiful A1000 with all sorts of add ons - with the promise I would not sell it. That was about 8 years ago, and I still have all the stuff (and still use it!)