I used to do my morning runs in a park area which was frequently used at night for illegal partying. So every once in a while I would find wallets with IDs, passports and a phone. Naive and honest as I was, I always took these to a police station that was nearby. I stopped doing this when the police started to (informally) accuse of me of having stolen these items, like the stories of the firefighter that would start fires by himself. I changed my running route so it wouldn't take me near the partying spots anymore.
