CEZ1 is rather easy, unless you have no rings. From the large ledge overlooking the last big room (the one with the drawbridge leading to the exit sign) look to the left, and you will see an alcove. Fly in there, and press the button with the boxes on it. You'll get hit by Detons, and you'll see the emblem to the side, where one of the Detons was.
CEZ2: One of the rooms is booby-trapped, you press the wrong spot on the floor, and enemies charge at you. Trip that trap, so that the rooms open, and in one of them is the emblem.