Have you tried the 'Trashcan' button yet BlackSparrow? Go into the Board Admin center and then on the right under security you should see 'Trashcan' and I just tested mine-deleted threads and they appeared IN this 'Trashcan' screen with the option to 'Restore' so if they are in there you can restore them yourself.
If you don't find them there-we'll have to wait for BbBoy to see what happened on the back end-I think you might find them in the Trashcan though so let me know what you find so BbBoy can go from there if we have to in the morning when he is back on. Ok?
I don't think the Archiver is supposed to delete them either so I am sure BbBoy will help you find them if something happened and they did NOT go into the trashcan.