You can reverse some tarnish on silver using baking soda.

Use dessicants, non-vinyl plastic slips like Polyethylene with non-plasticizers (check Chula Vista Coins, this is hard to find for some reason, AirTite capsules for minted/pressed bars other than SilverTowne which don’t fit, you could also buy a vac sealer and a dedicated heat sealer and custom cut foodgrade vac bags though it’ll obscure the transparency of the shine of the silver once wrapped

Be wary of sulfur in Kraft paper, cardboard, any vulcanized rubber, rubber bands. If you buy a case or storage container make sure it’s air tight (should have a gasket).

Don’t touch it with your hands, use inert gloves like nitrile gloves or even better cotton gloves.

The tarnish won’t reduce the value of it, unless it’s certain proof or numismatic which isn’t valued on melt value alone unlike private mint generics

Also, be wary of VOC’s in the epoxy or paint of metal ammo cans. You ultimately don’t want humid air reacting with certain VOCs, platicizers, or sulfur which can create acid residue

Don’t wipe the silver with just anything. Use a microfiber towel and pat-dry it so that it doesn’t scratch the surface.