Is it possible to mass undo thread moves?

[Gray Matter]

So I have had an archive forum on my board since it opened over 2 years ago. A couple of months ago, we decided that we didn't want the archive anymore (it was hidden to the members and really didn't serve a purpose) since it is just nonsense. There were over 200,000 posts in there, but I've managed to move the majority of them back through the Mass Move feature. However, now that I'm down to the last 800 threads and down to the nitty-gritty of it all, it's getting tedious and they can't all be easily moved out.

I'm looking for a way to kind of just "undo" the moves that were placed on them in the first place -- in essence, I want to send them back to their original forum. Is there some kind of query I can run on the forumID or something like that? I found this thread on vB.com but it's three years old so..

Here's to hoping.