U.S. dealer hides a tracker in a book and discovers that Amazon uses rare copies to train AI before destroying them: the product arrived at a warehouse identified as VGT3, which has a logo of a Tyrannosaurus rex about to devour a book. On site, employees remove the spine—the side piece that connects the cover to the pages—scan the content, and then destroy the copy. Dealers had already suspected this practice, but this may be the first concrete proof. These books are normally old works that have never been translated or have limited distribution, but that can still have historical and intellectual value, experts say. The information is from the Ars Technica website.