And to Dart, if somebody lost that amount of money, odds are they would go to the police station and report that they lost it. And, if someone turned in said amount of money, the cops would probably call them if a similar amount of money was turned in. It isn't like you can just go in and ask the cops if anyone turned any money in lately and claim its yours.
"Hello officer. I was wondering if anybody turned in any money lately."
"Why, did you lose some?"
"No, just wondering."
"Oh, well, somebody turned in $200 yesterday."
"Really? Well, I just lost $200 yesterday, fork it over bud."
"Okay."
If it were legitamitely lost by an honest person, then most likely they'd write it off and move on simply because there aren't many people of high integrity left in this world who would take it to any authority with the intent on reuniting it with it's rightful owner.
Property is generally deemed to have been lost if it is found in a place where the true owner likely did not intend to set it down, and where it is not likely to be found by the true owner. For example, a necklace found lying on the ground will be deemed to have been lost. At common law, the finder of a lost item could claim the right to possess the item against any other person in the world except the true owner. See Armory v. Delamirie, 1 Strange 505 (King’s Bench, 1722).
Most jurisdictions have now enacted statutes requiring that the finder of lost property must turn it in to the proper authorities; if the true owner does not arrive to claim the property within a certain period of time, the property is returned to the finder as his own. In Britain, many public businesses have a lost property desk, which in the United States would be called a lost and found.