In The Bourne Ultimatum (2007), at 415 East 71st Street, Jason handed Pamela the confidential documents that he had stolen from Vosen's vault using Vosen fingerprint:
Jason: They'll kill you for giving me this.
Pamela: 4/15/71 isn't much of a code. My guess is Vosen is on his way already.
Jason: Why'd you do it?
Jason: Because this isn't what I signed up for, what they did to you, Blackbriar.
Actually, Pamela cleverly passes the information to Jason about his birthday, saying it was 4/15/71. The truth is that she was giving him a code, referring to 415 East 71st Street. But if Pamela doesn't think it's a secret code, then why does she believe Vosen is following them?