Found some more swag in the '66:
Original owner's manual:
And something called a 'certicard', which I have never heard of. A quick Google tells me they were used by the dealer to get warranty information for servicing? If anyone has any other info it would be greatly appreciated. We found two of these, one of which matches the VIN of the '66, one of which matches neither car. This one notes an origin of Milwaukee, Wisconsin, the one which doesn't match either car has an origin of Vicksburg, Mississippi.