I have tries that numerous times. But as soon as I go through the doors leading to the courtyard (recreation area), the turrets on the wall kill me. I thought there might be a trick or something.
And to answer your question: Yes I did the whole 'go-into-the-smokey-cave-get-the-package-and-give-Vallance-this-parcel-thing'.
I can honestly say that the game has me stumped...