So glad you found your cat. We have also had 2 cats at our house and they have gotten outside several times. I have an idea though to help next time. I have taught my cats that the sound of a shaking kitty treat container means you get a treat. They have all learned to come to the sound. When I need them to go to the vet etc. I just shake the container. I also do it occasionally just for the fun of it. It is a great "trick" for you cat to learn. It has worked also when they are hiding under a car outside.