You realize that in order for all these events to happen a state would have to enforce it. (or in the libertarian example a privately owned organization that somehow is given the authorization to administer force) through some random code of ethics (laws) that people abide by...

Not that this matters. I see now that there are some areas where we disagree. I would call that car stolen regardless if the person it was stolen from is alive.

Many would be grand-theft auto/murders would be relieved to know all they have to do is kill the guy who owned the car in order for them to sell it without it being illegitimate.