Update on my Empress Car Rental.
Returned the car, they looked over it quickly, no problems.
They handed the second credit card slip back to me and filled out the other one with the final price (we had them throw a couple of beach chairs in the trunk, they added a cooler and an umbrella), and we were on our way to the airport.
Completely hassle free and would rent from them again.
Thank you all for your advice and recommendations.

Pete