Moving or removing a litter pan

Thank you both for your thoughts on this matter. I'm still not quite sure how I'm going to handle this matter. They are both definitely comfortable using the original litter box. I worried that my calico wouldn't ever use it again when the other girl started going in it, but that is definitely the most-used pan at this point. I think I might give it a try in time (removing it). I like the idea of not only cleaning the floor thoroughly, but putting something else in the space that the litter box is now occupying. I'm a touch nervous about this, since we seem to have a peace which didn't exist for a long time, but knowing we've gotten this far, I'm hopeful.