[@xXSINXx] A couple things wrong with both your posts, first off, humans have no knowledge of the deathnote and wouldn't think that it may be a fake copy of the real deathnote, nor do they know anything about shinigami actually existing. On top of that, the books were dropped recently, and after being touched, the deathnote belongs to that person until they die or give it up to the shinigami, so it wouldn't be in a bookstore.