The family may not even want it since he got a new one but it is worth a try like Breezie said!! they may be a-little on the edgy side when you show them what you got (some people just do not like anything to do with cemeteries,etc)
I once tried too return a coffin plate that I found @ a yard sale years back of a cw soldier who died in a battle to the family and they basically almost got upset! because the woman just didn't like the thought of it even though she was nice about it, I could tell she wasn't into that kind of stuff even if it was someone related too her.