Fascinating post!
John Locke proposed the labor theory of property (https://en.wikipedia.org/wiki/Labor_theory_of_property), but its very hard to this way justify private ownership beyond what you can maintain by hand. I sometimes have an understanding more akin to 'stewardship' , this is mine right now, or at least I pretend it is, and I'm going to take the best care of it while its in my care.