My 2000 SAAB 9-5 has a hinged plastic handle set into the trunk floorboard. This strange plastic setup had confused me, it has an indentation for a hand but it also has a hinge that flips up the plastic part and exposes a hole that is also shaped for a hand.
Why is it designed like that?
SAAB does everything with a purpose. The plastic part that flips up will rest perfectly on the upper lip of the trunk. That way you can prop the floorboard up while you mess with the jack and spare tire.