I'm not sure what all was lost. One of my staff went "delete happy" and nuked a large number of old threads while doing some housekeeping. While they were dead threads just taking up space, it would have been nice to keep them for the new people who hadn't seen them yet. But what's done is done.
One I know for sure was my BW haiku thread. If I can find a saved copy I will repost it. Some of them were pretty good.
Should pale death with arrow dread Make the ocean caves our bed Though no eye of love might see Where that shrouded grave shall be Thou! who hear'st the surges roll Deign to save the suppliant soul