I've got several of those "spam cans" of ammo, both rifle and pistol. Some is relatively new production (less than 3 years old). Is it better to leave it in the spam can, or put it in a USGI ammo can with desiccant and a humidity indicator card and check it once a year or so? How do I know under what conditions the ammo was sealed in the spam can to begin with? What do you guys do?