Trunk leaks but gasket is good

Water must be leaking in around the trunk seal somewhere. If you don't want the water to sit in the trunk, drill a small hole in the spare tire area at the lowest point where the water collects then spray a little paint in the hole you made. This will let the water drain out till you find the leak and then you can fill the hole back up later. You can put a seal around the trunk of your own with high adhesion weatherstripping till the leak is located.

DOES THE CAR HAVE A POWER PULL DOWN FOR THE TRUNK?? IF SO MAYBE NOT CLOSING ALL THE WAY..