I know he's not around anymore, but, to answer the question: I don't know. I never came across any. I couldn't even fathom what it would be.
What do you think qualifies as evidence, if you think you have any? That's a better question.
If you have it and the logic holds up; you'll have evidence and we'll probably have a change of heart. If you don't or if it doesn't, you'll get told why; making it not evidence for what you claim it to be.