I stayed at the Gray this weekend, and got the jar of folded cards as well. The agent checking me in didn't seem to know about the password (she was nice, but I think new), but the agent next to her, who wasn't helping anyone else, heard and brought out the jar.

Initially I picked a free upgrade (if available), but they were sold out the second night, and was told there was better stuff anyway. The second card we picked was a 'Chicago ammenity'. Agent asked if I drank beer (said yes), and also if my daughter, 2 and a half, playing int he check in area with mom, could eat sweets/popcorn. Said yes. They said they would deliver to the room. When we returned from dinner, there were two bottles of Mathilda (Goose Island) beer, a box of Frango chocolates (which, despite having lived in Chicago for 3 years, never actually had tried), and they also left a bowl of Garrett's Chicago Mix. We were quite impressed.