It works both ways:
I’m up to four phones returned to their owners. The longest took a week of calls and messages to mainly Polish people in the contacts. One finally gave me a meet up in town. He was homeless so his phone was his lifeline, he turned up with the usual dog and rucksac. I failed to refuse the can of beer he offered.
I got my house keys back having dropped them in the snow skiing, they were waiting for me in the tourist office.
However, I found an abandoned stolen Golf (broken window and ignition hot-wired) in a Peak District car park. I phoned the police and got nowhere, they refused point blank to note the reg number or location and made it clear I was pissing them off – I was tempted to tell them there was a dead body in the boot to try and raise their interest but just hung up disappointed.