planning to put 3 litter boxes for graycie in our new house once we buy one thinking to use a couple of 32 ounce deli cups(have plenty for my bugs) to pack her old used litter into them so i can mix into her new boxes think that will be enough for her to know right off they are hers? or should i pack poop and pee instead? she will also have a cat tree in the most used rooms we got plenty already