Maybe they did not have official officials (i.e. not FIFA approved) for the first match? So, the match would not be an A match.
Did you ask the DBU? They should know the reason. If they do not reply, maybe the Honduras FA will know? Failing that, perhaps FIFA will even know.
Incidentally, FIFA accepted all the 3 Central American matches of Denmark in 1985 as A matches in 1985, as evidenced by the list of A matches in FIFA News of March 1985. So, the decision not to include the matches must have been made after the matches had been played.