I once had a 16' flatbed trailer abandoned on my property. I called the police, presuming it had been stolen, emptied, and dumped. After taking the report, the officer asked if I wanted it hauled away. I inquired what would happen if it were, and what would happen if I kept it. He stated the city would sell it if not claimed, or I could keep it, but would have to give it up if claimed. I told him he had my number in the report, if they found the owner, and to told him goodbye.
[ After taking the report, the officer asked if I wanted it hauled away. ]
They probably would have charged you for hauling it away too....