I am trying to organize my gun room. As of right now I have my ammo in the factory boxes setting on shelves. My loose ammo is in ziploc storage bags. I have been looking at military type metal ammo cans. Where can the large packs of desiccant be purchased to keep the humidity from harming my ammo? Should The ammo be put in the cans loose or in the factory cardboard boxes? I would assume loose would be better for moisture control but I like the organization of being in the boxes.