In 1974, he rented a shop into which he placed his Nazi memorabilia. The outlet also became the venue for late-night drinking sessions with friends and fellow collectors, including Wolfgang Schulze, a resident of the US, who became Kujau's American agent. Kujau soon began to raise the value of items in his shop by forging additional authentication details, including for a genuine First World War helmet, worth a few marks, for which Kujau forged a note saying it had been Hitler's, worn in Ypres in late October 1914, thereby radically raising its value. In addition to notes by Hitler, he produced documents in the handwriting of Martin Bormann, Rudolf Hess, Heinrich Himmler, Hermann Göring and Joseph Goebbels. Although the handwriting was a passable imitation of the owners, the rest of the work was crude: Kujau used modern stationery, which he aged with tea, and created letterheads by using Letraset. In many cases the spelling and grammar was inaccurate, particularly when he forged documents in English, such as a copy of the Munich Agreement between Hitler and Neville Chamberlain, which read: