Heh, having spent much of my youth in Las Vegas I can tell you that if a casino has an unexpectedly large payout then someone is going to have a really really bad day. And that someone will do anything they can to deflect the repercussions. See the comment about the same issue at the Taj casino, 9 people got fired.

The only way to avoid getting fired is to both prove that the people who won cheated and that their cheat was something you could not have protected against.