Your idea is fine.

Three enhancements.

Make the outside box utterly unlike a book. Say twice as long as it is wide.

Put the book at one end of the box so it is very heavy on one end and very light on the other. ( This is really confusing to most guessers. )

Toss in a handful of shell of elbow macaroni in the empty side so it will rattle and make a ssshhing sound when the box is tilted.

Be sure you are present when it is opened.

Having only a clue in the original box is a masterpiece. I have never seen that done.
Source(s):
Personal ideas.

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I think you should run with your idea, I can't imagine a better answer being given!

Very Clever :)
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