What's in the package which Billy gives Madolyn in The Departed
Just before the climax of The Departed, Billy comes to Madolyn's apartment and gives her a package to keep safe and asks her to open it if he's dead or if he tells her to.
In a later scene, we see her naming the package Costigan and putting it in her drawer in her office.
This scene than cuts to Madolyn telling Collin about her pregnancy.
What's in that package? It is never mentioned in the movie again, is it?
Best Answer
When Sullivan comes home he has pastries. He is expecting the woman to be there like earlier in the film.
She isn't there because the envelope contained a full account of the truth. It told her to find Dignam (Wahlberg) and explain to him the truth. He had no way to know that Sullivan was the rat since Sullivan blamed this on the other rat and recommended Di Caprio for the medal. On receipt of this information he and the lady decide to kill him rather then go to the police.
This is how he is in the apartment as she gave him a key and why she wasn't there.
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Answer 2
The envelope's contents are never definitively explained in the film. However, it seems logical to assume it contains either evidence or at least an explanation of the truth - that Leo DiCaprio (i.e. Costigan) is the real good guy and Matt Damon (i.e. Sullivan) is the real bad guy.
Earlier in the film, Sullivan's girlfriend Madolyn finds out the truth about Sullivan through a CD - but that wasn't meant for her, but rather to show Sullivan that evidence existed against him. It's possible that this same evidence was given by Costigan to Madolyn (possibly with even more evidence/detail to be used in the event of Costigan's death).
In fact, given how the film ends, it's not too much of a stretch to believe that Wahlberg (i.e. Dignam) was either given a copy of the same evidence by Costigan or was given the evidence directly by Sullivan's (now ex) girlfriend Madolyn, which gave him the final "push" required to kill him.
Answer 3
The package contained the full truth about himself, being undercover and what not. To contact digman, showing the whole entire truth about Collin, everything. So she would know everything. It's very simple to figure what's in the envelope. Like he says when she is walking into her office "don't open this unless something happens or I tell you too" so she knew everything. That's why when she starts to say something, and he interrupts her saying "Whatever you're about to say, think about it real hard and in two weeks if you feel the same..." giving it time so he could do what he had to.
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