I agree with this. Would your family be upset if they knew about the value of this stuff? Does someone else who might have a claim to this stuff need money for something important? Are you being sneaky at all? If not then I say it's yours no problem, but I personally would feel a responsibility to do something nice with the windfall.

I once had a band mate/good friend buy a roughly $1k guitar for me as a gift. We were both mostly poor at the time. Though I really wanted to I wouldn't accept it -- it was too generous. I'm glad I didn't take it, though there wouldn't be any hard feelings if I had.