Chambers retaliated by claiming Hiss was not merely a communist, but also a spy, a charge he had not made earlier; and, on November 17, 1948, to support his explosive allegations he produced physical evidence consisting of sixty-five pages of re-typed State Department documents, the last of which was dated April 1, 1938, plus four notes in Hiss's handwriting summarizing the contents of State Department cables. These became known as the "Baltimore documents". Chambers claimed Hiss had given them to him in 1938 and that Priscilla had retyped them (Hiss could not type) on the Hisses' Woodstock typewriter for Chambers to pass along to the Soviets. One of the handwritten notes copied the contents of a telegram (received January 28, 1938) related to the November and December 1937 arrest and disappearance in Moscow of a Latvian-born man and his wife, an American citizen. Under questioning, neither Hiss nor his superior, Francis Sayre, recollected the incident. Hiss initially denied writing the note, but experts confirmed it was his handwriting. Interrogated in 1949, Sayre stated that the telegram was unrelated to Hiss's duties, which concerned trade matters and told his questioners, "He could not understand why he was on the distribution list for this cable nor why the note would be made on it or especially why an exact copy should be made."