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<p>[QUOTE=&quot;krispy, post: 724944, member: 19065&quot;]I think it&#039;s dangerous (potentially risky) to leave coins locked up inside cardboard boxes with no silica in there. I&#039;m wary of the moisture that cardboard attracts over time and the acids in cardboard boxes are nasty for all kinds of other materials as it leaches out acids from within the pulp and may &#039;gas off&#039; the same into the atmosphere within the sealed box. If you are located in a humid region like Georgia, this may be even more of a hazard. Cardboard also attracts insects that may wish to nest or eat the cardboard. I&#039;d hate for a generation of coins to be cracked open from their time capsules someday with unwanted tone or something having developed all over them, or finding out the holders had changed color (yellowed as being affected by absorbing acids from a cardboard parcel/box) or just plain began to dry rot. I don&#039;t think there&#039;s anything wrong with opening the shipping boxes up and placing the sets in archival zipper bags with silica tossed in for good measure if you intend not to open the sets themselves and to just stow them indefinitely. Just some things to think about.[/QUOTE]</p><p><br /></p>

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