Rizzo - Halo here. I'm sorry, I do not know the answers to your questions. I find humans very puzzling also.

My humans keep my litter box in the unused downstairs bathtub. They laugh when I jump out of the box and scratch the sides of the bathtub. Don't they understand that I need to cover my poo? So far it isn't working very well, but I know if I keep at it, it's bound to work someday. Dontcha think?