Was there trim panels for the rear of the interior above the drop down panel where the holes are for the nut access for the rear window trim. There is a discussion and some say yes others say no.
Not true, the corners have plastic trim panels to cover the outside corner piece trim holes! Only the center 3 holes have color matched plugs!
Picture of 2 sets of corner trim pieces! Notice the 2 mounting holes, they would correspond with the 2 holes I see in your picture, which look like they still have the plastic expansion plug fasteners in them!!