...instead of transferring to a 2x2 flip.
"Early Release/First Day of Issue is one I can think of.
@thisistheshow What @Insider2 stated is correct for OGP from the US Mint. The other possibility is for reholder and reconsideration then you would leave it in the slab.
Else it goes in a 2 1/2 x 2 1/2 flips.
If the original packaging is part of the provenance, if the OP is really protecting the coins unc state, or if you collect OP coins. Peace Roy