One other question: What's holding in the stock box besides those 3 10mm bolts? I removed those, but something was still catching towards the rear seats that prevented it from lifting out. What else needs to be removed to get it out completely?

 

you have to remove that rectangular trim that's running the width of your "trunk" right up by the seat backs. There's two silver hooks w/ 10mm bolts in them that you remove (one on each side) then just pull up and it pops off then there's one more 10mm bolt holding in a bracket for the sub toward the middle/right side.