If I were him I would send it back, it would be a sign of kindness and civility
Poophammer try to remember the golden rule, maybe one day you will be on the other side of the set up, who knows(and I'm not speaking to warband related things only)
Poophammer sold the heirloom before the guy posted this thread. Seeing the steal online, Poop took it, and turned a profit from it.
If he were contacted before he made the sell off, and he still did it, it's poor form.
HOWEVER, Poop did not know and the guy didn't post in time. From my perspective it was simply good business at the time, and it's sad that the sell off was made before he could be contacted, but nothing can come of it now.