Should I keep mint and proof sets in mint packaging?

I have some mint and proof sets in the cellophane and envelopes and the proof sets in the cellophane and purple boxes. I also have some Prestige sets in the velvet cases and box. These range in date from the 60's through the 90's. I have heard differing opinions about how they are more valuable in the mint's original packaging but some believe you should put them in different holders. What is everyone's opinion? If you think they should be put in other holders would you please tell me what kind are the best. I really would appreciate any suggestions that anyone has. Thanks in advance.

Melanie
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The only Proof coins that should be removed from their mint holders are pieces with exceptional cameos in exceptional condition. Those coins should be slabbed by PCGS because, in modern coins, those holders get the best prices.
Run-of-the-mill Proof coins that are removed from their mint holders have a strong tendency to go bad, and most collectors shy away from them. Many collectors want, who collect Proof sets, want them in the packages with all of the certificates of authenticity.
But.... if you do go to sell and they are not still in original packaging , they will be discounted quite heavily.
and they're cold.
I don't want nobody to shoot me in the foxhole."
Mary
Best Franklin Website
My Complete PROOF Lincoln Cent with Major Varieties(1909-2015)Set Registry
yes keep them in the original packaging. Throw a silicon pack in the box where you keep them too. This may help prevent some ugly toning/haze.
<< <i>IMHO the only proof set coin or mint set coin that should be removed from the government packaging and slabbed is a very valuable error coin. Something like the 1990 no S Lincoln cent in the 1990 proof set. Otherwise, keep the set intact. Steve
Darn...........I guess I shouldn't have slabbed all thoose 2004 MS coins. I guess I should just snap them out of the holders and put them back into an enevelope.
Thanks for the advise....................(I'm getting my vise grips out now.)