The Curse magically generated the book to ensure the break clause had a chance of success. It is rather strange how MM only noticed the book to give to Henry near the 28th year. Maybe the curse created it near this time and placed it in a location that MM might notice it.
I’ve thought about this possiblity, too. It just seems strange we have no idea who gave MM the book.
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Keeper of Rumplestiltskin's and Neal's spears and war paint and crystal ball.