Big white 9x11 envelope, not particularly thick. It just has a folder with Nassau Hall embossed on the cover, and it contains your letter, financial aid letter, a map of Princeton, and a car decal. (At least that what it was for ED students. RD students might get more paperwork? Anyway, I'm excited. It means we get more mail!
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Why would they send another application? Princeton doesn't accept transfers, so you either get in as a freshman or you wait until grad school. Those things can get expensive to print -- then they'd have to send them to thousands of people who will never use them?