You just need your ID or your Power Up Rewards card.
You need the receipt that they give you when you finalise your payment just before launch (assuming you are picking it up at midnight. If you lose [i]that[/i] receipt, then you are in some deep trouble. But otherwise, you ought to be fine.
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I'm not picking it up at midnight, school :-( I should be fine then, thank u
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My pleasure. Hope the school year goes well. [spoiler]Bungie didn't exactly do us any favours there. Still, it will keep the semester interesting, I guess.[/spoiler] See you starside!