Sorry, I can't prove a negative. You, however, are free to disprove it with a positive.
Why is it so important to you to prove the Nov. 5 meeting?
The involvement of Obama, or his surrogates, doesn't hinge on a specific meeting on a specific date. There are plenty of other ways to communicate, and cut-outs to communicate through. Frankly, I'd be surprised if there were an actual physical meeting, or traceable phone conversation, with Blago by anyone directly working for O -- they're too tightly controlled to make that mistake, knowing Blago was under investigation. They're quite a bit smarter than Blago, who is exceedingly dumb.
Then how could you know it? You didn't say that weren't weren't aware of other sources, you insisted that there weren't any. And you've closed your eyes to the additional sources I've posted above.
Why is it so important to you to prove the Nov. 5 meeting?
Backwards. Why is it so important to you to deny the Nov. 5 meeting?