The document predated the computer it sat on
Accounts were the trouble in a Newark-on-Trent partnership, where one side produced a document dated before the two of them parted. The machine that had created it was bought later, and the file's own internal record said the same thing the disk did. Our report set out the date, then the route by which we had reached it, then a plain caveat: nothing on that drive identified who had sat at the keyboard. Settlement followed shortly.