There is no lost and found in Miami. There are the wealthy and the scavengers. Anyone can become a scavenger, given the state of the economy.
If you are a treasure hunter in Miami, you need not rent a fishing boat or scuba equipment or hire divers. Your treasure is concealed inside the sand having fallen off a premier guest of the Ritz Carlton.
To find treasures, you do need to wake up early or buy a metal detector, or trip over a diamond necklace on the sandy promenade.