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Maybe this is a fraud. That would be pretty funny. I admit it's hard to imagine somebody faking an entire 700+ page novel, but I remember a news story about Harry Potter knock-offs being published in Russia. Rowling is not the only one who can write books of this size; she's just one of the few who manage to get them published.
If it's not a complete fraud, there is no reason to assume it's the final copy or that it hasn't been tampered with. Just because it apparently looks like photos of a book doesn't guarantee that it is unaltered photos of the book that will go on sale in a few days.
Eh, it's probably real. I admit I just wanted an excuse to write "Deathly Galley Proofs"