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If possible, when you choose your new kitten, ask the previous owner for a couple spoonfuls of dirty sand from the sandbox. You can carry it in an old plastic butter tub, or something similar. The sanitary unpleasantness of this is overshadowed by the ease of training for your new kitten to it's new sandbox. If the kitten smells familiar dirty sand in it's new box, she will not hesitate to use the box.