Got one of those things one time -never went off and like the Greys, we found food elsewhere, then went home. Thingie had a sticker on it saying there was a reward for return. Went by there a couple of days lager – the hostess thought I was returning it for the reward went to get the manager before I could say anything. He came back with the thingie, telling me it had been lost a couple of months before, and was very red faced when I let him know what really happened. Comp’ed us a couple of meals, so it worked out for everyone!