Hey there,
So it seems, much to the annoyance of some who have bought this item, that you can get the rewards from the book without actually spending the 1000 silver. This kinda seems like a pretty major bug that people can exploit, and so I thought that it would be worth mentioning.
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Once this is resolved, those who bought the book should be given something in addition to the book rewards. Something worth the 1000 silver, not a free horn package.