Vintage ink is plentiful.
http://cgi.ebay.com/Sheaffer-Ink-Vintage-Four-4-Bottles_W0QQitemZ260403191000QQ
[that’s one auction out of about 1600]
The creep in chief was born a mere 5 days after me and I know that fountain pens were still commonly in use at the time.
My mom used to bring home the old ones from “Sinclair Oil” where she worked as a secretary.
The point I am trying to make is that stuff that is already “old” is out there and would pass any casual “sniff test”.
Your first assertion is why I posted a government website about “faking” old documents.
People can artifically age oil paintings well enough to fool the Louvre experts and you think a lousy sheet of paper is undoable?
I’m giving up trying to make you understand what is capable of being done.
Good night.
There would be supporting documents in the jacket/folder and envelopes. Those would need to be forged with the appropriate numbers and labels and ink. There would be writing or notations on these items.
I have notes on mine and don't think it would be unusual.