Battlefield Bad Company 2 Pre-order Question EASY BEST ANSWER!?

all u do is keep the reciept it has the date and time and the day u go to get the game show them the receipt. or just go up there and have them look at the price if there is any difference in limited edition pre-order and reg or something they will be able to tell which one u bought and change it for you. just keep the reciept and remember date and price are key.