I'm in group 4 (or is it 5?). In the past, there were no posted signs and the CM's encouraged you to buy the mugs, by telling you they were good forever. Since I couldn't find anything or anybody to tell me differently, in the past, we brought back the mugs for years. Begining last January (2002) was the first I noticed the signs up on the wall, and now above the drink machines (although the wall sign in the All Star Music was down three weeks ago), saying good for the length of your current stay. In your room, on the tag that tells about the room pizza..it does say for your current stay. I asked the housekeeper for an extra tag and have it, if anyone wants me to scan and share it. In spite of that, yet again on this last trip, I heard the cashier saying it was good forever, and that it was good at all resorts.
Since, when I purchased my mug, I was told it was good forever (at my resort or sister resort), I do continue to bring them back..however I ask to see the food court manager the begining of each trip, and ask if mine is still reuseable (since I felt and still feel, that that one cashier saying it's meant to be reused might be incorrect info, but I've heard it over and over..even when we recently bought new POR mugs, that's what we were told..when I mentioned the signs, she said the CM's are being told, it's still allowed) . The answer from the food court manager has always been a resounding yes. He's the only person I feel I have to ask permission of to reuse my mug. Once he (or she) tells me that they are no longer allowing even those who bought while being told they could be brought back, then I'll stop. First, they have to stop telling the people who are buying them now..but for some reason, they still tell you they are good forever....it's like the signs above the machines are there...well, just because!