I would bet my life savings that this is a lie. Moore is a serial liar who would never reject anything--no matter how flimsy or patently impeachable--to drive his agenda. This is self-serving bullsh*t to make Moore seem to be more responsible than he is.
That said, Dick Thornburgh will probably demand Moore disclose who proferred these documents. Moore knows he can stonewall this to "protect his sources" because the CBS whitewash investigation lacks subpoena power. This will give him even more publicity, which he craves.
Reading some of the replies, I think many of you are missing the point. This is not about Moore rejecting material that can't be verified, it's about a link between Rather and Greg palast, who btw has also taken credit for providing Moore the garbage for his movie.
I agree, no way Moore turned down those docs. He never cared about supporting his positions with facts, why should he start now?