Research into the wartime civil registries of one of the civil registry offices in Upper Silesias (Poland) discovered many records that corresponded to deaths of inmates from the "Reichsautobahnlager Annaburg" and "Zwangsarbeitslager Niederkirch" camps.
A certificate of death for of Victor IJzerman as discovered there, stated that he died on 12 December 1942 in Camp Annaberg. In it was mentioned an official cause of death as “gangrene and decay of the body”. (Gangraen und Körperverfall).
The archives of the Jewish Council of Amsterdam has no information about Victor IJzerman but list his wife arriving in Camp Westerbork 3 October 1942; she had been deported to Auschwitz on 5 October 1942. Presumably Victor IJzerman had to accompany his spouse.
Private collection of Edward Haduch, Kedzierzyn-Kozle (Poland), the official death certificate of Victor IJzerman, issued by German authorities (Standesamt) of Annaberg and the Archive of the Jewish Council of Amsterdam.
However, by establishing the date of death of Victor IJzerman, the official date is maintained as stated after the war by the Dutch Department of Justice.