Why Japan is so successful at returning lost property www.bbc.com

It doesn’t seem to be for the finder’s fee or the opportunity to claim the lost property for themselves.
“Children are encouraged to deliver lost items to the kōban, even if it’s 10 yen (7p).
A child can deliver this coin to the kōban, the police officer will treat it formally as any lost item.
Of the 338,000 handed in to Lost Property in Tokyo in 2018, only 1% found their way back to their owner.
Knowing that many people would forget to claim their umbrella, Satoshi, a former resident of Suginami-ku, Tokyo, says he would trick Lost Property into handing one over if he was caught out in the rain.