Ed, if you just want to preserve and protect these boxes of ammo, consider the Foodsaver vacuum packing system. Toss a little bag of silica gel desiccant inside before you vacuum and seal, and your worries will be over. The heat-seal stuff will probably work better, though, if you want to wrap and seal the boxes individually inside something you can see through better.
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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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