Starting from mid-way down the right side, using a plastic tool, gently slide up and down the seam with light pressure inwards, trying to find a separation between the case.

Finding a small gap, insert the plastic tool 1 - 2mm into the space at an angle, begin to gently slide open the case. You will come across resistance were the plastic clips hold together. A gentle slide up/down motion and nudge should pop them apart.

Open from right, top, and down the left side. You will also need to turn it on its side to do the same on the bottom edge between the hinges.