Hi Brian -
Yikes! and double Yikes! My face is red. Your collaborative products with Chris Shores are iconic cornerstones in the field of aviation history and I have them all and frequently refer to them.
I have just one thought to add to what has already been said here. I do recall seeing a file or several files full of copies of Kriegsberichter articles and stories in the U.S. NARA guides to the microfilmed German records. It was many years ago, but I believe those files were in the OKW - Propaganda-Abteilung collection in Microcopy T-77. It would be a laborous fishing expedition to search there for what you want because the collection may be incomplete. Hopefully, the
Der Adler articles will meet your needs and you won't find it necessary to search beyond those!
Cheers,
Larry