If there was any evidence, we would have seen it by now.
Yes of course. And as the book I linked to states:
It was only in 2001 that it was possible to locate the places where the Germans buried the ashes of the remaining 250, 000 victims.
So as I understand it, they can't make up their minds if over a million pounds of remains and 8 million teeth are in the "ash mound" or the "graves"!
Monument for ashes at Sobibor Photo credit: Alan Collins
At Sobibor there is a pile of ashes in a memorial, which is shown in the photo above. This memorial contains the ashes left from the bodies of 170,000 to 250,000 prisoners.