That document in the picture seems suspect.
I would expect any document being generated by the FBI to have the FBI Seal on it...
memo
from the FBI.You can see the similarities in form. If it was suspect I'm sure the FBI would have denied it at trial.
There are plenty of other documents and such at a interesting article from Mother Jones. All interested parties about this case should read it.
In Search of John Doe No. 2: The Story the Feds Never Told About the Oklahoma City Bombing