Still, no one has got close to solving this, so here are a few hints:
1: Don't assume anything.
2: For each square you will use 1 of the two pictures.
3: In total, you will use 49 pictures.
4: You need to find the pattern before you can make your frst move (hi-res pic has clues to this which unfortunately can't be seen on the linked version).
5: Some of the book titles are clues.
6: Once you have the pattern, you need to start counting the pictures.
BR00158 - Open (47 days)
AU00xxx - Locked