If you are talking about Proof sets from the 1955 to 1964 era, I would leave them alone. The mint packaging preserves them surprisingly well, and they are much easier to sell when the times comes. Ditto for the mint sets from the same era.
Retired dealer and avid collector of U.S. type coins, 19th century presidential campaign medalets and selected medals. In recent years I have been working on a set of British coins - at least one coin from each king or queen who issued pieces that are collectible. I am also collecting at least one coin for each Roman emperor from Julius Caesar to ... ?
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My Collection of Old Holders
Never a slave to one plastic brand will I ever be.