They can put RFID stickers on paper cups. I don't know if they do. I got a receipt with breakfast that said original dated receipt for refills, but I didn't actually buy anything refillable. I saw a freestyle machine at the place near the front gate, inside the park. But I also ate at some place near Minions that didn't have one. The park isn't that big, one near the front, one in the Simpsons are and if there's one in the lower lot pretty much covers the whole park. I don't think Universal owns any of the places at CityWalk, so I don't know why they'd honor refills from the parks there.