We stayed at POFQ in Aug 2000 and we bought some just like that. They were refillable mugs. The resort was just called Port Orleans with the sister resort Dixie Landings. It was some time later that they renamed them both to PO, with Riverside or French Quarter added to differentiate between the two. Bonfamille's Café was already closed when we stayed there. I'd guess they were the original refillable mug there once they started the program. Each resort had their own mug. We bought some from OKW in 1998 on our first
DVC trip. But the refillable mug program there was not free; refills were $1. We also had them from our very first trip in 1997 at the Polynesian and refills were free for the trip that you bought them. None after.