You'd be surprised how well a serial number can be recovered even after it's been filed away. The stamping process that imprints each digit affects the metal un

You'd be surprised how well a serial number can be recovered even after it's been filed away. The stamping process that imprints each digit affects the metal underneath as well. Even when the physical characters have been filed away, the serial is readable using some advanced techniques[1] [1] https://www.washingtonpost.com/national/health-science/scientists-develop-a-technique-to-find-serial-numbers-that-have-been-filed-off/2015/05/11/45e76fce-d489-11e4-8fce-3941fc548f1c_story.html https://www.washingtonpost.com/national/health-science/scien...