When I got my boxster the keys were functional but looked horrible. Cosmetic only, but for me it's care in the small details that make an older item feel new again - here's a restored key next to original. About $60 total for the restore.
Two parts for this order:
Suncoast: Remote Control -
Upper Button Cap Code: 986KEYBUTTON
eBay: NEW PORSCHE 911 986 996 GT3 TURBO BOX CAYENNE TURBO
KEY HEAD REPLACEMENT CREST
Not perfect, but looks 10 years newer! Replaced the crest using a tab of rubber cement glue.