Can you say... "massive failure"?
Seriously, I know about 90% of the the people in GameStop infested countries hate that place (and many STILL go there because they don't have many other options -.-" ), but suing them because you weren't smart enough to buy it new for five more dollars? Especially if you specifically want the DLC? That's just stupid, especially since most people who buy it would use the DLC codes as soon as they can get online to redeem them, and that means they can't be used again -.-" This kid is just stupid. Plain and simple, stupid.
EDIT: I just want to make it clear that I don't hate used games. I think it's a great way to recycle games that someone doesn't want anymore; hell, most of my library is made up of used games, and some of them are worth more than some modern systems! But I just wanted to state that buying a game that's fairly new (if not BRAND new) to the market used is a bad idea. If it came with the code slips inside (as most do, for authentication purposes), then doubly shame on him for the reasons in the last paragraph. Did he thing someone was just going to let it pass and not use said codes? And if it didn't... then what the hell is he complaining about? No codes = no free DLC. Simple as that.