War crime trial files

Hello
I´m looking for a war crime trial in Essen Steele from 14.8.46 to 3.9.46.
Based on this thread.
http://www.ww2talk.com/forum/prisoners-war/32689-murder-five-captured-raf-officers-warning-graphic-images-new-post.html

Thanks to Andy, I still have some files from the waroffice about this case including a copy of the records of the case. But there are several evidences nearly 100 marked like photos and testifies of character which are named but not including in the copy.
Does anyone know the possibility how it can be possible to find out more about the trial? Maybe with trialphotos and so on...where you think should I ask for?

Thanks for your help