Was that the general impression? If so, to make it clear, all covers that are uploaded are stored on the ftp alphabetically by username.
Files on the ftp usually look like this
Username_custom/retail_system_gamename_region
The admins who work their way through the queue can choose from all the covers on the ftp which ones they want to process. Everyone has his own approach, I usually go by username and download all covers from one artist and check/add them.