Lovely pack, the wood buttons are the type I have been looking for and look great.
Could the description say whether the buttons include hover / pressed / disabled sprites, or whether the variation is colour-based? The demo only shows colour variants so it's hard to tell before buying. In Unity those map straight onto a Button's sprite states, and pressed matters a lot on mobile since there's no hover on touch.
Same question for Panels and the Book Container, they're not in the demo folders. Might save a few people asking!