It is not required for a safety as it is not part of the impact safety equipment like bumpers etc... Kind of funny though if it was rotted and full of holes then the car would not pass but remove it and its ok.
I dunno
I think that would have to argue with a wrench who failed a Fiero based on body holes in the decklid, trunk, etc.
With most front-engine cars the trunk isn't sealed off from the passenger compartment, so it's conceiveable that a body hole in the trunk area could let exhaust in, which I believe is the primary reason for the "no holes" requirement of a safety.
...but as we all know, you can punch as many holes in a Fiero's trunk or "trunk lid" as you like, and it ain't gonna change how much exhaust does or does not make its way in to the passenger compartment.