I'm also a fan of the vacuum sealing approach for long-term storage, or perhaps in preparation for a natural disaster that risks having them bobbing around in a flooded house. I'd also put a package of silica gel desiccant. The ammo can is good insurance, too.
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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