my 38 had that exact same stuff not only in the trunk, but also behind the front seat and up the riser to where the trunk floor came through into the passenger compartment. that area was also covered. since it was a business coupe, i'm guessing it was used because it was way more "wearable" than the rubber floor mats of the day, and items could be slid in and out without harming the surface, yet keep said items from sliding back and forth while going down the road.