If I go out at on Tuesday and get a off-the-shelf copy of BO2 and not my pre-ordered copy how will Activision/Trearch/Microsoft know it's not a pre-order to not give me nuketown?

Surely on day one shops are only going to have one batch of discs and just set enough aside for the people that pre-ordered and put the rest on the shelves? I can't see there being 2 separate batches of discs, one with nuketown dlc, one without?

I only ask as I've pre-ordered but am going to try and blag a copy a day early tomorrow.