Use a box made from acid free paper.
Store plastic/wood/paper packing materials/instructions separately from the cartridge as they may eventually outgas various nasties.
http://www.pfile.com/trk/acid-free/photo-storage-box.html
I store rubber parts, "O" rings, belts, etc., in such.
Photo shops and Art stores often carry stock (acid free boxes/paper).
Store plastic/wood/paper packing materials/instructions separately from the cartridge as they may eventually outgas various nasties.
http://www.pfile.com/trk/acid-free/photo-storage-box.html
I store rubber parts, "O" rings, belts, etc., in such.
Photo shops and Art stores often carry stock (acid free boxes/paper).