If you are talking about recent (post 1998 sets) they are not sealed and can be opened and closed without damaging them. Earlier ones opening the set typically or definitely destroys the holder.
As a dealer I even break apart my Proof and Mint sets as they tend to sell for more broken apart than in the packages.
But as a dealer would you PAY more for a set broken up into singles than you would for the full set?
Edited by Conder101
11/14/2019 7:10 pm