These are a couple shots of the book that Twitter user @WPR_haru had made using the in-game photographs he took in The Legend Of Zelda: Breath Of The Wild. Pretty clever. That way you can always have a piece of the game with you. I actually did the something similar with The Witcher 3: Wild Hunt. "You put the game disk on a necklace chain." Now GameStop won't buy it back from me!
Keep going for a couple more shots of the inside.