I'm surprised that a Porsche dealer would sell 17 year old Boxster on the lot. here is some more help if you are still having issues...
remove 4 screws and pop surrounding panel
NOT THE FUSE PANEL ITSELF...
This is the plug...
This is where it plugs into the switch. since yours is missing I would contact
986 Forum - for Porsche Boxster Owners and Others - View Profile: itsnotanova get a new one or source one as it is only a three wire switch.