I misworded that.
woops!
I ment like actual German records of killing people(or something like that) which were destroyed before Germans fled the camps when Allied troops got close and this keeps some Germans from believing it happened.
I know there are documents(woopsie me), movies, even the death camps that are still there!
I can recall some of my history professors telling me this, but I can't remember specifically what it was.
My bad
Maybe it was the fact it was so unbelievable that someone would do something so horrible and sick.