This book, which was hollowed out and contained several tiny drawers and a glass bottle, was presented as a "Medieval" poison cabinet, "bound around the year 1600" and an "Assassin’s arsenal" in places around the web - the writers of these articles failed to notice that the auction house that was selling it listed it as a " Historism, 17th-century style.", which in Germany means something that is a reproduction meant to look like something made in a past age. The date that the artifact was made was not estimated, but the art movement that produced historisms flourished in the late 19th and early 20th century. Parts of the artwork could be older, like the engraving that was pasted on the inside cover, but the final product was finished much later.
(Image via Imgur)
And here is a listing for a similar book that looks like it was made by the same artist, that dates it to the 19th Century:
and another similar one sold by Hermann Historica
There is an anachronism in the piece that shows it wasn't made in the 17th century - I'll leave it to the reader to find it!