I'm not sure if this will work but if the book is now showing in your ADE library, what information does it give if you select it (I know you can't open it) and use ctrl-I (cmd-I on Mac)? For books you do have access to it shows its license information, and with luck it will at least give the information for a book you don't have access to and remind you what account the book is licenced to.
ctrl-shift-I will also give information about how ADE is currently registered/authorized.