I think there may be some confusion over what makes this an Amazon exclusive and how many disc are included.
The movie's
entry on this site's database states that it a three disc set with an "Amazon Exclusive Bonus Disc", however Amazon's
listing for the item states that it is a "limited and numbered Amazon Exclusive 2-Disc Blu-ray Ultimate Collector’s Edition" with "Amazon Exclusive Bonus Content".
A few folks (myself included initially) on the forum seem to be a little confused as to where their third disc is, but it does seem like a three disc set doesn't exist.