If you're releasing advanced copies of your new video game, you probably want to make sure everything is perfect, lest the reviewers critique you for something that won't even be in the final version of the game. Of course, while you're probably focusing most of your energy on the game itself, it's generally a good idea to at least take a good look at the box art and spelling, lest you release "revelaitons" to the world.
Link Via The Consumerist
B) it allows them to track where the advanced copies go