There really was no trick. I discovered a piece of paper in the case that just says to pry it apart from the middle edge.
However it takes a scary amount of force to get it apart. This case ended up breaking while I tried to remove the iPad. So I had to return it for a refund. And I want to say a big thanks to Bear Motion Tech on Amazon. Not only did they refund the item, they refunded the shipping and even gave me a pre-paid return label.
So I wouldn't recommend this case to anyone. But at least the seller was really nice.