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The AFP reports:

Residents of a Tokyo apartment building are baffled after a total of 1.81 million yen (15,210 dollars) was found in 18 mailboxes by Saturday, a police spokesman said ... Since June, dozens of city halls and other public buildings across the country have reported finding neatly packaged envelopes full of cash in men's restrooms ... [On July 25], bills worth 960,000 yen were inexplicably seen "falling" in front of a convenience store ... The largest single dropoff so far was in the ancient city of Kyoto on July 23, astonishing a 67-year-old woman who found an envelope containing 10 million yen of stacked bills in her mailbox.