I don't expect you to do it for me, but once I have a backup of the most recent database (probably a few hours before this happened), if I want to copy the threads from that database to the new one how would I do it?
That is out of the realm of support I am willing to give. Just run the query I suggested nunerous times and those 4 threads will appear as normal sticky threads. Or install the add in again and unannounce the 4 threads.
This sounds like something that would be ideal for an add-on developer to automate. Or something to add to a future version of XF, so threads or forums that have been deleted — or disappeared — for any reason, can be easily recovered from a backup.