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oh, they said this, too:

"5. Make an Outdoor Litterbox
A sandbox will tend to be an attractive place for cats to do their thing. Take a very large Rubbermaid plastic container and fill it with regular "kiddie sand box" sand. If you can, put a couple of pieces of the cats' poop in it to attract them. The cats will enjoy digging in the fine sand and will shift to using it. Scoop occasionally and once a month or so, dump and replace the sand.

If you want to be extra neat, use a large Rubbermaid storage container for the box, filling the bottom with several inches of sand. Then cut a door in one of the sides, above sand level and approximately 8 x 8 inches. Keep the container covered.

To be even neater, take the Rubbermaid storage container, turn it upside down and cut a hole in the side. Place a normal litterbox with regular litter inside the container. "