I've lost my wallet multiple times in my life. Always got it back, intact (ie. nothing missing). Why? Because most people (99%) are good, and people are empathic to such circumstances. They'll help you out. I've done the same (in The Netherlands, the police will forward it to the city council).

Last time was a year ago. I lost my wallet out of my back pocket at a tunnel, on the road. I did not even know I was missing it, when someone was on the door. His son found it. I gave him a bottle of wine as a gesture (couldn't come up with something different, it all went fast).