Mulder: So you're saying someone came in here, killed Keats, and then just did some work on an old Dr. Arthur Grable file?
Scully: Well, I can't access the ARTHUR file. We're gonna need the password.
Mulder: Try 15626.
Scully: How did you know that that...
Mulder: This is Arthur Grable's work on the same fluid dynamics equation the others were working on. Look at all those entries. Someone has been continuing his work in the six months since he died.