Interesting question...

A friend of mine, recently gave me a small plastic bag full of cameras, that once belonged to a relative of her.
Two of them were boxcameras, and they still have unfinished rolls in them. I asked if she would have the unfinished rolls back, but she didn't care, and I was told that I could process the rolls, or throw them away - she didn't mind.
So maybe I'll finish those rolls, or maybe I'll throw them away - I don't know.