lol, my cats love boxes, too. My Trixter is VERY territorial, and he will "claim" most of the boxes for himself and if he sees Smeagol even going near them, he will pounce. Neither of them growl or actually hurt eachother, but it will initiate a wrestling match. Sometimes Trixter lets Smeagol have a turn in the box, it just depends on his mood. He wants Smeagol to know who's boss! lol Smeagol loves to chew around every edge of the boxes. We are always replacing them. lol But the cool part about the chewing of the edges is that he manages to keep his teeth REALLY clean doing it! Trixter will bite off the pieces from Smeagols chewing and spit them out all over the floor. haha, you should see the mess in the middle of the living room each and every day. They love to show off! Our cats run our house.