Perhaps they got it from Indiana Jones.

More than 80 years after it was first published -and later outlawed- in Germany, a signed copy of Adolf Hitler’s infamous manifesto “Mein Kampf” was sold on Thursday for £21,000. The semi-autobiographical work outlining Hitler’s anti-Semitic ideology, was sold to an anonymous telephone bidder at an auction in Ludlow. Written in 1924 while Hitler was serving a four-year prison term in the southern German region of Bavaria, the book was first published in 1926. Although it has been republished abroad, it has been banned in Germany since the Second World War. – From Telegraph