Here is another aircheck from the Gary Pfeifer collection -- Tom Robbins sitting in for Mike McCormick on May 16, 1968. It runs from 11:09am to 11:39am. It's mostly untelescoped, but some music and the full COMEX newscast by Ron Owens was not recorded.
I don't know anything about Tom Robbins, if that is his real name or that of a LIN Board member. If anybody knows more about him, feel free to comment.