When I pulled the rear speaker shelf cover off to get the speakers out, it came out unbroken in one piece, but the factory grey carpet literally just fell off.
Looks like I'm going to be recovering it, and when I looked at it I noticed I don't need to use the child seat anchors. I deleted the holes for those by gorilla gluing more, particle board? circles into the holes. The rear shelf cover is kinda crappy felt carpet wrapped in... that stuff that you nail into the back of Ikea furniture.