Just the fact that they...didn't! There were death-books from Auschwitz, which were quite meticulous, but they only documented deaths in the 10,000's. These deaths were attributed to typhus.

The 'holocaust' deaths are completely undocumented. And the two main repositories of 'evidence' -- Treblinka/Belzec -- have never been investigated because, of course, that would mean 'desecrating the bodies'... that may/may-not be there.

Well... there was an informal investigation done by an Australian Geophysicist who used ground-penetrating radar to prove that the ground hadn't been disturbed, and thus 800K bodies could not be buried there... But then the jews threatened him, and paved Belzec over with jagged concrete so that no one could ever do any research.

Totally reasonable, right!