Hi there,
Sorry for the late reply.
There is an official service that may be able to help, if you are willing to wait some time. When I did some research about one of my grand fathers, I contacted the WAst (
http://www.dd-wast.de/) for information and they provided me with some info that I did not know or was not certain off. The fee a few years ago was 16 Euro, and the wait was I believe around 3 month.
I hope that helps.
All the best,