Taxi drivers often make heroic efforts to return lost property to passengers. The lost and found system has a flaw- it relies on cops. Taxi drivers are supposed to return items to specific precincts and tell the cop at the desk where the person who lost the item got in and got out of the taxi- but often these are unknown quantities.
I'll never forget the time I tried to return to NYPD some jewelry that had been left in my cab- given to me by a passenger. I had no idea who left the stuff, or when. I brought it to the appropriate precinct for the place the finder had gotten into my cab where the desk officer sent me off to the precinct that covered the place where the finders got out. There I was grilled like a suspect and "tripped up" by the desk cop who threatened me with an "LD six" or something like that. I left the precinct and called 911 hoping I could retrn the item to whoever would be dispatched but this was a plan that had no future whatever. Finally I went to the first precinct where an apparently gay desk cop accepted the item. I later got an email from TLC telling me where to pick up the jewelry I had lost.
Now if I can't find the passenger (it's usually a cell phone and I wait to be called) I drop the phone off at my garage where they keep them in a safe.