I'm no lawyer, but I asked CFC regarding the definition of a container and storage in such containers, and she replied to me as any opaque object that encases your firearm in a safe manner is considered a "container". She said I must secure the container with a lock so that it is hard to break into.
The box that comes with the pistol seems pretty fragile. If I were to put one in a container, I'll trust a Pelican case more than I trust the factory box.
Why? Do you think a pelican case would prevent anyone from retrieving the content?
Read my other posts on similar threads. It's not the intent of the law to prevent your guns from being stolen but rather to prevent you from quick access to guns and ammo.
Therefore the size and strength of the container/cabinet/safe/vault/room are irrelevant.