Changing Brake lights on my 2001 honda civic Ex

On some of the newer cars they still will have a foam seal around the perimeter of the tail light that will be very difficult on removal. Do you think you have all the screws removed? If so, try putting some pressure on the tail light, with one hand on one side of the light and one hand on the other side. Not to much pressure just enough to see what is holding it in place and preferably near the corners and work your way around. If you have a hidden/missed screw this will show you without damaging areas.