Now that's cool. Guessing you're not going to open it? 1969 & XM16E1 according to package date & Mr Snafu. I don't know if re-pack or not. Possibly re-pack as it is a replacement part, it sure isn't stamped re-pack. Wondering if square or round forge? Still kinda early for M-16A1 03/69. Everything I've had that late was round forge going off barrels installed on them and everything matched color wise and proofed, no dings at gas tube. Quack! Quack! Duck! Think you could feel it if square forge? Might try with eyes closed on a couple with paper over them or such on the pieces you have out the package, then feel that package. Please don't mess it up on my accord.
Only NOS sealed receivers I've had were much later in clear, light blue, or yellowish plastic with different colors of ink yellow or black I believe. I opened all mine and threw packages away. Thinkng A-2 is earliest I've ever had. Thank you very much for sharing. Love to see what's inside. I always opened that stuff just to make sure someone didn't pull a fast one. Seen a more than a few modern parts in early dated sealed packages in last few years.
Mike, kinda missed the box thing distracted by the cool factor and what was behind door #1. Probably could mic box OD at FA area and determine if it has a FA on it or not as mentioned by another poster.