Actually, it's quite easy. You don't need to search.
1. Sort threads by author name or title (do this at the bottom of the screen), and find your (Monday) threads.
2. Start a new thread in a new window (right click -- open in new window.)
3. One by one, open your Monday threads in a new window. Select the url, alt-tab to your new thread, and paste it in.
Tah dah!