There's an Atlanta dealer, they can probably do it. Classic Cadillac.
Once you've got the locks open and can open the doors, there's a manual release for the trunk. Open the rear driver side door, pull straight up with some force on the rear seat bottom cushion. It'll pop out. Just move it off to the side a bit. What you actually have to remove is the seat back. Once the seat bottom is out of the way, put your hands underneath the bottom of the seat back and pull straight up. It'll pop out of place. Move it out of the way then look along the top of the area that you've exposed. You'll find a plastic ring there (either black or white, depending on if you have the updated rings or not). Pull the ring, it'll release the trunk.
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