in the boot (Trunk) probably
http://forums.swedespeed.com/showthread.php?165303-Some-new-pics-of-the-S80
Interesting post here:
http://www.volvoforums.org.uk/showpost.php?s=c962c3c67acdc768e9ebc9bd22ca9cd8&p=171740&postcount=10
Comes from this thread:
http://www.volvoforums.org.uk/showthread.php?p=171740#post171740
XXXXX, October 2015