I had reserved my Yeezy V2 Oreos thru the adidas confirmed app and purchased it here very easily. I showed my passport and voucher on the adidas confirmed app and I was able to purchase. You could use an ID or Drivers License instead of a passport. You just need something witb your DOB.
The store is not that big and there are plenty of employees to help.
Now the location is kinda wierd considering that it's not in a casino. It is just it's own separate store. I would recommend parking at the MGM.