Obtaining forged documents by using FOIA? There is no way Rather got these Docs. via a legitimate FOIA request.
This is not impossible. Suppose the forger (or an accomplice) just happened to drop the fake documents into the archive files, knowing that an FOIA request was in the pipeline. Once the request hit, an innocent archivist would pull out the papers and process them in the normal manner. The DOD and State Department are just full of people who could and would do something like this.