The situation is this: you’ve just found a bag containing $100k (or your local equivalent) in cash. You, being the law-abiding Persephoneer I know you are, bring it to the police. The police, after conducting a thorough investigation, tell you, “Finders keepers.” It’s legally your money; let’s say it just dropped out of the sky. No one’s missing it.
What do you do with that money?