From 2020: “With an inner-city population fast approaching 14 million people, millions of items go missing here each year. But a staggering number of them find their way home. In 2018, over 545,000 ID cards were returned to their owners by Tokyo Metropolitan Police – 73% of the total number of lost IDs. Likewise, 130,000 mobile phones (83%) and 240,000 wallets (65%) found their way back. Often these items were returned the same day.”
Source: https://www.bbc.com/future/article/20200114-why-japan-is-so-...