One such reported transport of a small number of prisoners (the fifth out of six) departed on July 8, 1942.
Rabbi Yehoshua Moshe Aaronson (sometimes written Aronson), a prisoner in the camp, originally from Sanniki, kept a secret diary that survived the war. He reported that the Gestapo established a list prior to the selection and informed the selected prisoners that they would be transferred to a hospital and eventually to a place with better and easier work conditions.
The Germans did not name any destination. However, Rabbi Aaronson presumed that their destination would be Chełmno, based on his in-depth knowledge of the area (he had spent several years in Konin and its surroundings) and on the report of an escapee from Chełmno. In January 1942, i.e. prior to Aaronson's deportation to Czarków, Abraham Cohen (or Kohn), another resident of Sanniki, informed Rabbi Aaronson that many local Jews had been gassed in Chełmno, and explained the way the death camp worked....