No I can't provide a link as there is no easy way to search for them and it may not be obvious which ones they are. The following is part of an email I received back from Borders Australia staff today:
The issue causing you concern at present is the inability to migrate these books to ADE. I have looked at your account and cannot see any links there. I will investigate this and get back to you. There are some e-books that are available only in the proprietary ePub format, which you would know does not transfer to ADE.