I'm at UQ too... But I don't go to the main campus (although I live really close to it)
After you guys left, I got my thickshake and was talking to the lady that seems to own the place ... I'm pretty sure she said that she'd like the sticker back - thought it was pretty cool. She also said that they're going to refurb the place later in the year and was looking for some ideas (more chairs, maybe a couch or two).
You must have only just missed us, Smity. I left about 9:30ish, I think.