[Keyser.]

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1) What is in the small black box that Costello gives Sullivan right after the Academy graduation while they're sitting in the car?

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I haven't seen the film in a while, but I remember thinking it was a cell phone.

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I assumed it was a check/lots of money, the kind of money that would enable Damon's character to buy such a nice apartment. I can't see Jack saying the line "you earned it" if it was just a cell phone.