Forum Search Engine Ignores Archived Threads

When utilizing the search engine to more conveniently locate old threads, I noticed it only brings up those that are "active," i.e. new posts can still be added. Archived threads which have been locked manually or automatically cannot be searched for, and must be located manually. This might not be a "bug" in the most technical sense, but I figure it deserved attention regardless.

On a related note, posts made to threads that have since been archived will not show up in the poster's feed history; I discovered this trying to locate an old post through my own feed, only to realize it was only showing posts from threads still currently active.