In case anyone with any real power is looking... the boards were last indexed on May 29, 2013. Two and one-half months ago.
To test this yourself, select one of your less frequently used boards. Click on Advanced Search > All Messages > in last six months (be sure to check that "board" vs "all boards). Then, set the messages per page to 50 and move page by page until you reach the most current message in the search - which I have found to be 05/29/2013 in two groups.