I talked to Carl Walker by phone last night. He said the record book did not include the date when P-69 was finished. He had guessed that it was 1979 from information he had on other guns. I sent him the material I presented above on my P-68 and P-97 pistols for him to consider. I'm waiting for him to look at that material and respond back to my emails.
It is possible that the box and the label on the box that the seller has with P-69 has been erroneously influencing the assumed date of manufacture.
That label, and the box itself, may not be from Green River Rifle Works. I don't know how the company packaged and shipped their pistols, but the original boxes I have seen that rifles had been shipped in were plain, inexpensive cardboard boxes. Address and other information was written on these rifle shipping boxes with a Magic Marker (a Sharpie for the younger generations). It is possible that the label on the box is something that a gun shop created some years after the pistol was manufactured.