I posted 4 different exterminationist sources here claiming that one Soviet aerial bomb destroyed all Belzec train records in July 1944, two weeks before they reached the Belzec camp: viewtopic.php?p=91912#p91912
But it is impossible to know with complete certainty that they were actually destroyed in that bomb, perhaps they were in the building, and then the records were destroyed by the Germans, and afterwards the bomb destroyed the building.
Merely "trying to hide something" is not proof of mass murder; the "transit camp thesis" does not imply or even suggest that the operation would have been uncontroversial. Quite the opposite: The mass resettlement of Jews was, according to document 3244-PS (Martin Bormann on the solution of the Jewish Problem) something that:
"not all 'Blood Germans' are capable of demonstrating sufficient understanding for the necessity of..." viewtopic.php?t=9280
I will also point to my recent thread on the deaths in transit to these camps: viewtopic.php?t=12910
The following document was posted in the "21 Questions for Holocaust Revisionists".
The page calls it "Operation Reinhard Secrecy Oath" and the document refers to "evacuation of Jews" - not killing or extermination. The "21 Questions" asked why the "oath" says no photographs can be taken, which is standard procedure for such controversial military operations. So it would be understandable that the Germans would destroy the train records even if the camps were "Merely transit centers" - perhaps if they knew that they would have a genocide blamed on them they would not have destroyed them, but this is just one speculation after another.
Anyway, in the debate a document was cited as evidence that the Germans destroyed the train records. I closed the page and now I can not find the referenced document. It may have been this one, since I think it was either to or from Globocnik (if my memory serves me, as that name for some reason):
5 January 1944 Globocnik Report to Himmler (4024-PS) on Operation Reinhard(t)
The "Vouchers" here are not train records, but it does say "all other works concerned in this matter" which presumably could also include the train records.There is one additional factor to be added to the total accounting of "Reinhardt" which is that the vouchers dealing with it must be destroyed as soon as possible after the data have already been destroyed by all other works concerned in this matter.
I will keep digging to see if I can find that original document that was cited.