I missed your OP but just read it. How long ago were you able to access the MB pool with an expired key card? As long as I can remember they swipe the key card so an old expired key card simply doesn't work anymore. Most of the Vegas pools have wised up to this old scam and now have a security checkpoint where you must have a valid key which will be swiped for verification. I know a few good back doors to gain entry but not at the MB. I'm only curious because MB is about the only pool in Las Vegas where I have been unsuccessful sneaking into :D