I have gone through my DVD collection.
The missing titles are:
À bout de souffle
Pierrot le Fou
If you see a pattern developing here, so do I. They're all foreign language films, but even that doesn't make any sense; when I was dividing the section up by genre, I didn't separate the foreign films, À bout de souffle was in crime, Persona and Rashômon were in drama and Pierrot le Fou was in comedy. Damn it, I think I loaned them to somebody, but whom?