I have always gone to the players club desks whenever I needed a copy of my card ( at any property). Our upcoming trip I have 2 people in our party whose names are on reservations that signed up for mlife online. Can they check in with just their numbers written down? or do they have to stand in line at mlife and get their cards first? I have occasionally read posts were people stated that they had their cards printed out at the check in desk, don't remember what hotels they were staying at though. Talking about Mirage if it helps with answers.