David Lens, brother of Simon Lens and both unmarried sons of Elkan Lens and Flora Kosman, was working as a waiter, just as his brother. They both lived at home with their parents in the Bierstraat 30a in Den Haag. Besides his brother Simon, David had also his sibs Salomon, Jozef en Israel. They were married and were killed with their families during the Shoah, just as Simon, his parents and David himself.
At his registration card from the archive of the Jewish Council, it could not be distracted when he was registered in Westerbork but certain is that David has been put on transport to Auschwitz on 18 September 1942.
This transport, with more than 1000 deportees, was one of the so-called Kozel or Cosel-transports, which meant that during a stop at Kozel, located ±80 km west from Auschwitz, boys and men between 15 and 50 years forcedly were seperated from their families and had to leave the train to be deployed as forced labourers in the surrounding labour camps of Auschwitz. And those, who remained in the train were transported onwards to Auschwitz to be killed there.
From the transport of 18 September 1942, about 200 men were selected for forced labour and most likely David Lens was one of them. It is unknown where David ended up and when exactly and how he has lost his life. Many forced labourers have died in the labour camps due to inhumane treatment by the guards, diseases and hardships, but also were men selected for the gas chambers of Auschwitz-Birkenau if they were no longer "usable".
Therefore, the Ministry of Justice ordered the Municipality of Den Haag after the war to draw up a certificate of death for David Lens, in which has been established that he has died 31 December 1942 in Auschwitz.
Sources among others: Municipal Archive of Den Haag, family registration card of Elkan Lens, certificate of death of David Lens C3162 dated 17 November 1950; the file cabinet of the Jewish Council, registration card of David Lens and the wikipedia website Jodentransporten vanuit Nederland.nl.