One story from Holocaust deniers I've been seeing recently is that "There were no autopsies that showed Jews died from gas." Does this story have any veracity? Were autopsies done on holocaust victims? And if so, where did this story come from?
Im no historian, but for us Jews it's a big no-no to do autopsy, or cremation, etc. After death. I suspect this is partially where this claim comes from.
Also, the Nazis tried to cover up a lot after Germany fell and the liberation was on its way.