If it's loose, it's just LL and dictates the price LL figures fetch.
If it's carded I.e. MIM, then it will demand a price due to MIM collectors and variant collectors wanting it.
If it is MIM and carded, the back of the card Is usually more Matt in finish and slightly darker in colours.
Also ( not all) MIM cards have a small hole in the back behind the bubble, which I think was something to do with letting the heat out during the bubble sealing process, also MIM may have a smooth seal ( not a waffle pattern).
But I am no expert, just trying to learn :wink: