Losing stuff in Japan

People lose stuff in Japan (and everywhere else). In Japan, they actually return the stuff. There are zillions of stories of people leaving backpacks on subways and getting them returned, contents intact. But, what happens when stuff isn't claimed? Apparently, there's lots of it and they're fixing the laws on lost/unclaimed stuff.

Umbrellas get lost/forgotten all the time; but since you can get them for Y100 or Y200 at a 7-11 or 100 Yen store, no one cares...