Roberto had this fairly interesting conversation with a Revisionist fellow, who confronted him with the claim that the former Auschwitz commandant Rudolf Höss told the former press adjutant of Joseph Goebbels, Moritz von Schirmeister, on 31 March/1 April 1946 that "I could just as well have said that it was five million Jews [killed]. There are certain methods by which any confession can be obtained, whether it is true or not."
But there is one thing the fellow did not tell. There exists no verifiable source for the claim.
The origin of the story is Robert Faurisson's article How the British Obtained the Confessions of Rudolf Höss (1986), Faurisson writes that he received a 2 page testimony of Moritz von Schirmeister in September 1983 in Washington - from no other than holocaust denier Mark Weber. There is just one hitch: Faurison was not "yet authorized" to tell the "exact source". And Faurisson is not only hiding the source but also the document itself. It was not published by him or Weber.
So we end up with nothing else than Faurisson and Weber's assertion that there exists this document, but cannot be disclosed and examined - since almost 30 years.