Springfield Research Service maintains a list of rifles for which there is some information, which is where, I believe, Peconga got his information. Getting a "certified" letter is a bit of a hassle. You contact SRS and are required to subscribe to there magazine, Martial Arms Collector. As a subscriber, you can request a letter. I believe the cost is in the $60-75 range. What you will probably get is a "official" letter from SRS stating the rifle is in their data base and a photocopy of the original sales receipt, showing to whom and when the rifle was sold. I am not sure it will indicate if the rifle was sent to Griffin & Howe.