Kobe, a kid working a summer construction job in Belgium whose crew found a buried stash of gold worth €9M or 10.5M USD in today's money, is the inspiration for this question. I'm assuming in that event, half goes to the property owner and it's 4 construction workers and a foreman splitting the other half. The rightful owner has 5 years to claim according to local law. What would you do while you wait that out?
In my particular situation, I'd do nothing differently. Especially since it's not guaranteed. Even if it were guaranteed, I'd just be relieved that soon what few financial concerns I have would be gone. That's all that would change, I'd be a bit more relaxed.