Property rights don’t go away because someone made it easy for you to violate them.
Mints are put out explicitly for you to take. Property right intentionally transferred.
Mints are put out explicitly for you to take. Property right intentionally transferred.
Same for any lost property, if you find something valuable (wallet full of cash), you generally have to turn it in to the police, and there is a notification process to try to find the owner, and after a period of time (generally 3 months), if no one has claimed it, it's yours. Again, local laws are going to differ, but the general legal concept, that "A finder of property acquires no rights in mislaid property, is entitled to possession of lost property against everyone except the true owner, and is entitled to keep abandoned property."[1] is common.
There's some old saying about possession being 9/10ths of the law....
[1] https://en.wikipedia.org/wiki/Lost,_mislaid,_and_abandoned_p...
Of someone leaves a car on my drive I can do something about it, you may not be able to do in your territory. I'm surprised there isn't the a legal concept of abandonment though, what do you do if someone drops an empty can on your land?