The Germans tried to burn the paper trails they left along with the punch card census evidence from their IBM provided early computer systems. It didn't work.

Nuremburg 2.0, when we finally get there on the timeline, should be able to recover enough of the evidence to bury the actively complicit bureaucrats participating in cover-up of the elite's planned genocide executed by our own governments as a democide. There won't be any use for sparing the guilty this time either. (Although, I personally would argue that operation paperclip played a big part in accelerating our nation getting to this time of great evil now, so I don't believe it was worth doing originally either.)