As a G-Mod shouldn't you see what is in Cspace's Bin? As such isn't it more likely that said topic(s) are in a passworded forum?
Aye, I did searches like you, Goto.. I couldn't find anything else but what you found, and it wasn't 'deleted' into Cspace's Bin either. Mysterious
To Mod-dom
If you have access to the admin-cp, which I would guess you do, then you can search via the admin-cp and that should show all forums.