A postcard remains that Henderina Aptroot-Hildesheim wrote in 1943 and threw from the train between Amsterdam and Westerbork.
Jewish Historical Museum, Documents collection, inv.nr 7258
In addition, a Jokos file (number 11212) on this person is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.The Jokos file reveals that a claim was lodged for compensation for looted securities or bonds. (W-claim, number OS. 8 / 51).