If your account subscribes to Essentials Collections or has purchased Add-on Content (see more info here), you may wish to determine if this content is being used. Use the “Title Usage by Collection” report on the custom reports page (Admin log-in required). This report is based on the COUNTER BR2 report, but additionally shows the collection information in column C (miscellaneous titles are called “Add-on Content”). Unlike other title usage reports, this report will also display titles with zero usage for the specified time period. See more about running usage reports here.