If someone loses a limb and the limb is hypothetically moved to a different country, I think most people will agree that the limb is still "part of" the body (i.e., "owned by" that person), even though the body is now in two pieces.
But if someone shaves hair off his/her body and we move the hair to a different country, I think most people will agree that the hair is no longer "part of" the body, even though something that was once part of that body is no longer attached to it.
So why really is that? How do we decide what parts of an entity inherently change that entity if they were removed?