Morgen arrived the day after the massacre had ended.[12] He compiled a report from the testimony of eyewitnesses, a portion of which was read out in the pre-trial interrogation of Ernst Kaltenbrunner at Nuremberg: "the men went first, filing into one trench, and later the nude women had their own separate trenches....all passed silently and methodically through the trenches, so the executions went very quickly."[13] (Claims that Morgen was present at the massacre itself, and tried to prevent the industrialist Walter Toebbens from intervening, are unfounded.)[14] Two packages of dental gold, sent by an Auschwitz dental technician to his wife, had been confiscated by postal inspectors and passed on to Morgen for investigation.[15] Realizing that the gold must have been collected from Holocaust victims, Morgen sent an investigative team to Auschwitz and later visited himself, receiving a thorough tour of the killing center at Birkenau.