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The spam can prevents air from getting to the ammo and preserves it from rust or corrosion on the outside. But if the powder was not handled right, the corrosion comes from acid inside the cartridge case, and the outside packaging doesn't affect that at all.
On a slightly different subject: At one time, sellers of ammunition used to advertise ammunition with corrosive primers as "non-corroded", hoping the buyer would read that as "non-corrosive". If asked, the seller would say that the ammo was bright and shiny, with no sign of corrosion. But the same would not be true of a rifle barrel after firing his corrosive primed ammunition.
Jim
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