As a veteran of sneaking in extra libations at events, I cannot imagine the logistics of bringing in a 6 pack. There are so many other, less obtrusive, easier ways to sneak in.
A 6 pack? That is SO not one of them.
If they are truly "sneaking in" a six pack (where exactly do you a hide a six pack where its not obvious?) they get points for just being successful.
(Collapsable flasks, or refilled water bottles that look sealed, are where its at.)