Opening and resealing a hard plastic proof set without damaging the packaging?

I have 1970 and 1971 proof sets that have milkey toning on some of the coins and wondered it the sets could be easily opened and then resealed afere removing the coins for a dip in MS70. Has anyone tried to do this?
Thanks, Charlie
Thanks, Charlie

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more difficult. In any case you'll be left with the problem of having to reseal them,
and they will have some white along the seams where the "welds" failed.