Sorry, I wasn't asking that last question of you specifically. I should've put them the other way around to make that clearer.
I'm really looking forward to finding out how many of the library-only cues are pieces I know. I know there's one cue, a somber one at the end of a third-season episode with no credited original music, that's never heard anywhere else, and I've always wondered what it was from. I figure it must be a library cue. (I can't remember what episode it was, though.)