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<p>[QUOTE=&quot;Phil Ham, post: 1107675, member: 5787&quot;]I guess the grading companies have been lying to us when they claim that the coins in the &quot;air tight&quot; holders are guaranteed forever.&nbsp; Remembering my Physical Chemistry classes in college and the painfully complex discussions of Heisenberg uncertainty principle, it is possible that sulfur or for that matter anything could appear or disappear in even a fully air tight container.&nbsp; According to the principle, it is even possible that the entire coin could leave the fully enclosed container.&nbsp; I guess my point was that the likelihood is extremely small of damage from sulfur or other elements damaging the proof or mint sets despite their proximity to the cardboard box.&nbsp; I place my sets with the cardboard in a zip lock bag and in a drawer more to protect the box than the coins.&nbsp; I also insert the mint mailers in the zip lock bag that often come with sets.&nbsp; I file the packing lists for proof of purchase from the mint.[/QUOTE]</p><p><br /></p>

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