Just wondering if anyone knows the longevity of the corrosive 7.62 X 39 ammo after the crate has already been opened. The way things are going it's been taking me way too long to get through a crate due to obligations. I may have this stuff for several years before I even open the next crate. If it's stored in a dry location is it much different than being in the welded container? I would think that the original container being air tight would make a big difference.