I agree with briCK. my suspicion is that when mods are clearing up, they accidentally delete stuff.
People should learn to cla**ify their posts properly, but I have to agree, the search functionality is terrible - I don't think I have ever successfully found anything using the search dialogue box. I know Google charges a fortune for their high-end search engine to be implemented on sites, but there must be an alternative.
I'm always amazed that Tate can find stuff - hence the name, 'The Librarian'