Lack of interest Search for Locked Threads

How about the ability to search for locked threads? There have been many a time where with my forums that I wanted to search for only locked posts for one reason or another.
I have a need to search for closed threads on some of the sites I take care of. There are cases where I have to search for history of closed tickets for reasons of showing a pattern of behavior before banning a user. A checkbox to indicate "Limit to closed topics only" or similar would be about what I would look for. Even if it is not a publicly listed search option, as an admin option would certainly be beneficial (to me, anyway).