So, being the savvy traveler that FT has taught me to be, I called last night to confirm my reservation at the MGM. I was set to arrive today (Sept 22), and used that package promo posted a while back. Also purchased my AA tix... all done in July.... also got all my email confirmations for my dates
The front desk said that I was a no-show b/c I was supposed to arrive on Sept 15 (last week!). Sounds like a server error to me (since I had my confirmation email). It was late at night, so all they could do was forward me to "casino marketing" so THEY could book me that package (now I'm double-charged). I have to call/speak to customer service today to get my charges reversed.
Observations:
1) If you booked the MGM, CALL TODAY to make sure all is well.
2) I didn't appreciate the fact that a couple people initially said, "But YOU didn't show up on the 16th...."
3) I'm definitely looking to get comps for this little debacle (spent a good hour dealing with it when I was supposed to be sleeping

).
4) This would've been a nasty surprise if I had just arrived at LAS and tried to check in... and a bad start to the trip.
Be aware!