Other German War Plans Before 1914

I was watching the Great War on YouTube and their new video on August von Mackensen and they mentioned his assignment to the department that dealt with plans for Russia, Austria-Hungary and the Balkans (which would mean Oberquartiermeister IV according to quick research) which got me wondering: Have any of those war plans survived the 100+ years since they were made? I'm especially curious about plans against Austria-Hungary or Russia-first plans. It would be of serious interest for alternate history, after all.

I have doubts that the plans have survived two world wars and a string of different governments and collapses, but I'm curious if someone here that is more well-read on the subject of general staffs and war plans can help.
 
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