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<p>[QUOTE=&quot;baseball21, post: 2372667, member: 76863&quot;]There are slabs older than 30 years now and you can find coins that have been in those original ones that long.&nbsp; Other coins have been in a slab basically that whole time but the slab has changed.&nbsp; We have a pretty good idea at this point of how they age and what slabs are more or less likely to induce toning from the labels ect.&nbsp; </p><p><br /></p><p><br /></p><p><br /></p><p>If anyone has ever spilled something on a slab and gotten water in it I think they would appreciate that feature, but more importantly it is just an additional step showing the strength of the seal which is getting it closer to being airtight which is the ultimate goal.&nbsp; PCGS has changed their slab every year for sometime for that reason and NGC just redid their labels as well.&nbsp; </p><p><br /></p><p><br /></p><p><br /></p><p>You can&#039;t open and reseal them.[/QUOTE]</p><p><br /></p>

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