Used a knife on all 12 of mine so far (build for me and a build for a buddy). I started at the end AWAY from the data connect, worked one corner, got it to pop, worked down towards middle, went to other corner and popped it, worked toward middle again...POP/pry back (don't be shy but hold firmly). Gently turn over and pry outward on plastic enclosure (bottom piece that is left) and it will slide out (be careful not to drop of course, put a hand/finger/table w/ padding/etc. under it).
Thought for SURE I was gonna slice/gouge a finger/hand at some point...must be my 'lucky assembly roll of the dice'...this time :-D