When the LOI site is rebuilt, one of the first tasks the build process performs is to download the archive-media-list.txt file from the server. This list is used in the diagnostic processes to check the existence of items on the server and in the HTML page creation. The XSLT function
loi:getResponseFromServer (in the globals module) checks each pointer to an item on the server and checks whether or not that list contains that item, returning 404 if it's not on the list, 401 if it's on the list but is not public, and 200 otherwise.
That list is in /home1t/loi/www/archive and should be regenerated automatically