I got an M1A used a while back, it came with 2 20rd mags in plastic wrap over brown paper. The paper has markings "1969 MIL-P-3420B" and the plastic that wraps them is sealed and looks like it is original. I supposed these were new Military m14 mags and didnt touch them. Is there a value in these other than the fact that they are pre-ban 20 rnd mags??