Regarding the date of death of Aaron Croiset, the conclusion nr. 14 is valid of “Auschwitz Volume II: the deportation transports of 15 July 1942 till 24 August 1942” which reads:
All male persons, elder than 15 years, but 50 years at the most, who have been deported from Westerbork on 17 August or 21 August, , the day after deportation but at the latest during the course of October 1942, in the area of concentration camp Auschwitz have passed away, unless individual establishing of decease has taken place.
Source: The Dutch Red Cross.