How does a chain store make that kinda mistake? Usually if you scan a shipment it says when the game is supposed to release.
Same way they make the mistake of checking in product that releases on let's say Nov 11, 2011 but don't put it out on the shelf for a couple weeks, or until one of two things happen...
1. Some irate customer comes into the store demanding to know where their copy of "insert title name here" is since they called and were told they had 15 copies in the store, OR
2. One of the stock boys is an avid fan of the game and notices it sitting on a shelf in the stock room.