Veeery funny. :) Yes, they refill your empty containers. (Hard plastic, not cardboard.) The stealing food lol was inspired by a reply the late comedian Milton Berle gave to a heckler at the only Hollywood Walk of Fame dedication ceremony I ever attended; substitute 'joke' for 'food.'
Thanks, and yes, just like we saw a giant litter box in Petco (although of course that was litter). On my next/last visit to that Petco for Graycee supplies I took a moment to ask. It's an enviromentally consious promotion; bring in your old containers, get a discount on litter.