I view the board with the several eons option. It lets me see the last 500 messages. (Threaded Listing).

Original posts have been disappearing for the last few days.
Example:

Monte Carlo thread. My original post and several replies were gone in midweek, but Michael Knapps reply and my reply to him were still there. Mu guess is about 5 posts were missing from the thread 2 days before the big dump on Friday.
Hope this helps.