At both trials, a key to the prosecution's case was testimony from expert witnesses, stating that identifying characteristics of the typed Baltimore documents matched samples typed on a typewriter owned by the Hisses at the time of his alleged espionage work with Chambers. The prosecution also presented as evidence the typewriter itself. Given away years earlier, it had been located by defense investigators. This trial resulted in an eight-to-four deadlocked jury. "That, according to one of Hiss's friends and lawyers, Helen Buttenweiser, was the only time that she had ever seen Alger shocked—stunned by the fact that eight of his fellow citizens did not believe him."