Very easy. It just pops out. I used the plastic tools (purchasable at Pelican Parts or Harbor Freight for less) to remove my dash components. I too plan to replace my CD case. The part number is ...
996-552-253-01-01C-OEM $46.75 1 $46.75
Storage Shelf, Upper (Satin Black), Boxster 986 (1997-2004), Brand:
Genuine PORSCHE
Or you can buy it online at Eagle Day (where I first found it)
BOXSTER / 996 CONSOLE STORAGE SHELF
FWIW, be sure to keep the original part. There may be little blue caps on the back side you may need to transplant to the new part. Found that out on my environmental cover.
Threaded Mode
