I began by flipping the F5L009 upside down.

The case is held together by small tabs all along the sides. Work the spudger between where the two halves meet. I started on the side with the ethernet port, since it seemed to be the most flexible.

Once you get a bit of the top and bottom halves separated on one side, start sliding the opening tool around the entire case until all the tabs are disengaged. I found them to be rather "soft" and easy to disengage without breaking them.