I'm not sure if the evidence was kept after the Nuremburg Tribunals, but it filled numerous freight train boxcars. That'd be a nice pile to plop holocaust deniers upon. Tons and tons worth of documents, photos, reports, records and ledgers compiled by Wehrmacht clerks counting the people, their personal items, and gross weight categories of valuable materials taken from camp victims. That'd be an actual Slippery Slope, trying to make you way down off a 50 foot tall pile of loose documents.