In your first post, you said; I finished my contract with the Army recently and went to sell the gun to start a gunsmithing business. I got my FFL, but when I went to sell the gun, the ATF said it's restricted. Although the initial transfer to me had no restriction on it, they found that it was imported in the early 80s, and that it's a pre-86 dealer sample.
At that time what else did they tell you about having possession of the weapon? No guidance, no what to do by law? The above post suggestion is by far the best. Contact the ATF again, go over the part of how you came into "legal" possession of the piece, and what to do. Also, they should already have an investigation in process of the person who sold the gun to you. When all is said and done, ATF still holds the power of legality for it, and if you take it upon yourself to make their decisions...……… Best you get with them, to restore the correct status to the weapon, (on paper and in possession of) to CYAWP. Otherwise you have become complicit in the screw up between the seller and the ATF.
Trust this; ATF reads this too, watching for confessions.