Ones I have from in the trunk on 66 San Jose cars are normally long gone and as described. Circle reinforcement for the tag and the wire. One attached to the trunk spring, one attached to one of the inner trunk panel passenger side, one attached to the inner structure drivers side. Another example from 67 was sandwiched (welded) between the wheel house reinforcement bracket and the divider panel it appears
So no good hanging tag pictures from me at the moment from 66 trunk. The OK for shipment tag has been reproduced a few times in the past. Have seen it printed on a couple of different colored paper also