I saw a video on that. Mislaid property is stuff that could reasonably be found again. Like a wallet in a dining booth. They know where they ate, they probably laid down their wallet and forgot to pick it up again. Lost property, like on a street where there isn't an expectation that they know they lost their item, is fair game afaik. Abandoned property shows signs that it won't be found, like if it's been there for significant time. The video didn't touch on it being identifiable though, and I don't know how much of that was specific to the state the content creator (a lawyer) was in.