While I have excellent records of our builds, I'm afraid I can't trace down wood sources that are this old. I do know that we purchased this wood when we were on 45 Foley Street, and we moved in 1989. However, we wouldn't be able to provide business records of this transaction like an invoice.
Since only the 25th Anniversary model, this guitar and a handful of others were made with Brazilian Rosewood, I have not done any CITES exporting of this species, so I have no experience with the particular documentation required. If a letter stating this is adequate, then yes, I would be happy to provide this for you should you acquire the guitar.