pretty sure none have changed apart from Roswells, same password but different day.
You said passwords work for diferent people but thats only true for the first one currently. The OP also said he knows the passwords so he's already experianced with the system and most probably knows when the passwords worked in the past. You also didn't note that the day to use rosswells password was changed.
(reading this back makes me feel like an ass, i mean nothing by it im just overly analytical)