Anything more than a couple of dollars, I would post on the neighborhood e-list if it’s near home, or walk into the store if it’s near a store. I’ve seen times when $20 is way too much to lose, the difference between eating and not eating.
I’d turn it in, if you mean to the police, if it’s closer to $200. My boyfriend once lost that much out of his pocket, and someone did turn it in to the police station. They told him people do that all the time. This was in the seventies. Wonder if that’s still true.
In any case I would not just pocket it. If I didn’t find whoever lost it, I would give it away somehow.
A silver dollar buried in the garden, though—that’s mine.