I did not attend, but I do have a question. Were the DO folks the only guests in the hotel? The event was during that time that many college fraternity and sorrorities have formals, other schools are on spring break, etc, etc. If other groups or events were going on than it is possible that a person affiliated with another group took it. From what I read though. It sounded like the participants of the DO made off with anything else in the area that had CO on it, so why would the carpet be "stealing" and the posters, etc, not be stealing. I have run many event in hotels and the housekeeping staff often puts things "aside" for us in there room with out asking, thinking that it was left behind.
I don't know if it was or wasn't stolen, or if it was or wasn't stolen by a fellow FTer, but unless someone admits to it, it will never be solved in this thread.