I don't have paper or email documentation. I know what I know because the friend was Andy Sudduth. He was the first postmaster at the OSF. I came to work at the OSF a several months after the worm was released, and heard the story from the other Computer Facilities people who were there at the time.
I think that Sudduth testified at the trial, but he had left the OSF by the time the case went to trial. So I think this was all discussed in the court documents of Morris' prosecution. Those should be public domain.
--Dean