Separating the rear panel of the Audio Cover door
Green arrows highlight the two locking tabs on the top/front edge
There are two more tabs at the bottom edge (scroll down to see more pictures below)

 

Audio Cover rear panel - inside Audio Cover rear panel - outside
Panel - Inner side
Orientation is the same as if you could
see through the Audio Cover door, looking towards front of car
(Click to see larger picture)
Panel - Outer side
As if viewed looking out from CD player towards rear of car
(Click to see larger picture)