Did you look at the base of the round, I have seen the 2 digit date stamped on the case on mill ammo.
Thanks RickCappi, There will be a code on the base of the cases. It will be something like WCC 82 - which would mean that the ammo was manufactured by Western Cartridge Company in 1982. Just tell me what the code is an I can decipher it for you. I feel that the first photo will be WCC 82. The other photo certainly has one carton of TW (Twin Cities) ammo probably with a WWII date but the other cartons are of an unknown source (at least until you find the headstamp code) since there is some obliterated information of the carton itself.