After confessing that a contractor misplaced a USB drive with the personal information of 4,60,000 residents after a night out, a Japanese city has been left with more than just a headache, CBS News reported.After confessing that a contractor misplaced a USB drive with the personal information of 4,60,000 residents after a night out, a Japanese city has been left with more than just a headache, CBS News reported. Japan City Contactor, On Night Out, Loses Pen Drive With 4.6 Lakh Residents Data: Report