Cracking is easy, but kinda stressful? Just get some wire cutters and snap off one of the corners up top near the label, until there's a gap/void that opens up into where the label is.
Then get a thin flathead screwdriver (or similar) and wedge it in along the label, and just lift it upwards, using the bottom of the case for leverage.
After a bit, the whole thing will just pop apart. BGS has an extra protective sleeve around the card inside anyway.
There's loads of videos about how to do this, but they all say similar stuff.