E-mail #2 for the bug #81 has a subject "BUG ID #281" - obviously Bugzilla placed it into the wrong directory
Another example of the same problem: http://developer.redhat.com/bugzilla/data/maildir/09/1
I've updated the procmail rules to be a little more sane on the pattern match. I will monitor to see if the fix is correct.
looks like the new procmail filters are correct, I have not seen any misplaced messages