Beilagen A & B are suposed to be in Chapter 3, i.e. between pp. 117 and 191. I can not find them in any edition I have looked at so far.
Our own Oli Schmidt posted in the same thread you refer to, the following:
"The orders of battle for the campaign can be found here:
I note that this is essentially the same information which I directed you to in my first post above, and that you have already viewed.
Amedeo Matteucci posted in the same thread: "I think the information you are looking for (i.e. the original OOB of the Prussian Army at the start of the campaign) is contained in Beilage A and Beilage B of Hoepfner's work that are, unfortunately not visible in Google Books' scans (as is, unfortunately, customary with all foldouts and maps).
One of our colleagues might be able to provide you directly with Amedeo's e-mail address or that of Daryl Hosking - neither are current members.