This is sort of spoilerish about this topic. This is from the recap on abc.com about the scene where August was working on the book. I am going to put it in spoilers in case.
http://beta.abc.go.com/shows/once-upon-a-time/episode-guide/episode113-what-happened-to-frederick
“Back in Storybrooke, August is in a non-descript workspace working on what looks like a counterfeiting operation. But instead of money, he’s working on new pages for Henry’s storybook. He’s painstakingly aging the new pages to make them match old ones, then adding them to the book.”
I think those are legit written by someone who is attached to the show.
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