IBook missing from iPhone 6 plus?

I had my iPhone backup to the computer before I took it to the Genius Bar. I ended up getting a new phone. I got home and restored it however, all of my files in the iBook disappeared. I saw it for about 3 seconds when it disappeared after I touched it.

How can I get it back? It's not in my iTunes iBook section nor is it on my phone.

It was never there get it from itunes

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