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 David van Stratum as discovered there, stated that he died on 15 December 1942 in Camp Annaberg. In it was mentioned an official cause of death as “body decay”. (allgemeine Körperverfall)
The archives of the Jewish Council of Amsterdam list David van Stratum arriving between 3 and 5 October 1942 in Camp Westerbork and that he had been deported "eastward" on 16 October 1942.
Private collection of Edward Haduch, Kedzierzyn-Kozle (Poland), the official death certificate ofDavid van Stratum, issued by German authorities (Standesamt) of Annaberg and the Archive of the Jewish Council of Amsterdam.
However, by establishing the date of death of David van Stratum, the official date is maintained as stated after the war by the Dutch Department of Justice.