Hmmm... I phoned U-Haul, small town franchise... the guy who knows the piano story was busy, so they suggested I "drop them off".
I suggested that if they are going to throw them into a corner somewhere, I might not want to go out of my way to drop them off. I suggested the owner, who knows about the piano people, can call me and arrange something more definite, or assure me that he will contact the folks.
Anyway, clerk started quoting U-Haul privacy policy. That is when I said to have the owner call me. I figure they will put them away somewhere, and unless the people call and ask about the parts, they will just get thrown out someday.