a couple of other points...
Where is the report of Wilson's last trip to Niger? Reportedly, there was no written report, just a debriefing.
In an agency where all employees must get clearance for any public discourse, books, articles, etc., why didn't anyone get Wilson to sign a confidentiality statement (in relation to his NYT Op-Ed that started it all)?
There should be at least one peice of documentation of Joe's trip. Somewhere in my stack of stuff, I have a quote from Joe saying he was reimbursed for his expenses by the CIA.
He must have submitted an expense report. There must be a check stub.