If you want the same result without something sticking up from the trunk lid, try this:
Go to a store that makes vinyl type signs...the type that are hung between trees or posts to advertise things. Have them make a few cutout circles on vinyl slightly larger than the holes (the two closest to the trailing edge are slightly larger) and paint the circles with touch-up paint prior to removing them. Stick them over the 4 holes and you can't tell that the holes are there without going really close up to the lid.
I've had mine on for years and the paint hasn't peeled from the vinyl yet. Simple fix, cheap and cosmetically superior (IMO) to carriage bolts.