My experience with Arolsen: in the 90s I wrote them and they confirmed my request. It took them approx. 6 years to answer and tell me where and when my Grandfather had perished.
Last year I wrote them an email asking about my Grandmother (who survived) and a few more relatives. I received a few pdf files a few weeks later with a lot of information. So I would recommend Sally to simply try it again.
Good luck and best regards,
David Seldner, Karlsruhe, Germany