Man loses USB flash drive with data on entire city's residents after night out
https://edition.cnn.com/2022/06/24/asia/japan-amagasaki-usb-data-intl-hnk/index.html
Finally, the lost USB was found, though CNN can't catch up with the latest news so far.
Anyway, it should be avoided to store important data on memory device like DVD, CD, or USB. They should be stored in intranet server or computer which is not allowed to bring out. Amagasaki City Office should teach employees how to save data.
But, another possibility is that he might have wanted to work home. If it's true, there is another issue.