According to the "Sterbebücher" (death records) of Auschwitz, Aron van West was murdered there on 21 August 1942. This date is different from the official date of death as determined by the Dutch Ministry of Justice after the war. For the time being, the website joodsmonument.nl, list only the dates of death, as published at the time in the "Nederlandse Staatscourant" (Dutch Government Gazette) by the Ministry of Justice.
Sterbebuch Auschwitz (death record)
Official death certificate nr. 140 for Aron van West dated 4 August 1950