I called the non-emergency line for the local police department when someone went home with my wallet after I left it on a plane, tracked with an AirTag. 2 hours later an officer said they didn't have probable cause but could knock on the door and ask anyway. I think he basically offered for there to be no trouble if they gave it back, thief claimed they were "going to return it to lost and found", and sure enough I was able to go show my passport at the station and collect it the next day.