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<p>[QUOTE=&quot;dreamer94, post: 340119, member: 6449&quot;]The proof set cases (the mint calls them lenses) used to be fastened together much more tightly than they are now.&nbsp; I&#039;m not sure if they used to be glued, but it was very hard to get them open without damaging them.&nbsp; I opened a 1968 set and had to use a hobby knife to open it and broke the plastic in a few places.&nbsp; You&#039;re right that they&#039;re relatively easy to open now.&nbsp; They don&#039;t use any kind of glue. </p><p><br /></p><p>You shouldn&#039;t depend on the plastic&nbsp; lenses to protect the coins from the air or from humidity.&nbsp; They should be stored in a climate controlled environment just as if they were in 2X2&#039;s.&nbsp; This applies to slabs from TPG&#039;s also, although those are sealed so that they can&#039;t be opened without destroying them.[/QUOTE]</p><p><br /></p>

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