Obviously out-of-character knowledge:<br/><br/>Carter has passed out all of the keys to Room 2 already (including keeping one to himself).<br/>I believe Leda still has the two extra keys for Room 1.<br/>Sandra has the keys for Room 3, and that's fairly well-known, since 4 or 5 people saw her pick them out of the pool table.<br/>Dillon has the keys for Room 4, but nobody knows that but him.