Poop, There It Is

I introduced a new litter system at the beginning of the month. Tidy Cats Breeze. After a few days, one of the cats started using it to pee. But no poop! I knew the transition could be yucky and long. You are not suppose to clean the old litter box during the transition time. This is to encourage the cat to use the new clean box. However, since I was only trying to transition KC to the Breeze system he just transferred to Kafka's box when his became disgusting. So, I took his box away. That was a week ago. Tonight, Kafka pooped in the Breeze box. I was so excited. It seems KC has taken over Kafka's old box and Kafka moved into the Breeze box. I wonder what will happen if I get a second Breeze box.