WARNING: This page is about a different car, the 2006 Dodge Magnum, 2006 Dodge Charger, and 2006 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Trunk Rear Trim Panel
Courtesy of DAIMLERCHRYSLER CORP.
Remove the four push-pin fasteners (1) that secure the trunk rear trim panel (2) to the inside of the deck opening lower panel (3).