We can't see them anymore, so there isn't a way to (as it stands right now) retrieve your threads from them.
What you can try doing though, is searching for the title of your thread(s) along with "RuneScape Forums" in Google - there's a good chance you may be able to get a cached version of the first page of your thread, so you can get the contents to recreate them in a new section.
Immortalizedsaid: actually I was able to contact a fmod on forum help and he salvaged one of my threads. granted this was on the first day. Yep they are all gone now. So Google Chache is the only way now. Comprehensive Account Security