The envelope I was referring to was the one given to the girl - - not the one with "Citizens". So what was in the envelope given to the girl? I think it probably was the undercover's record (which was deleted in the system by the rat) and proof of who the rat was. But was the envelope given to Marky Mark (I assume so) which brought him in the end to kill the rat? Nevertheless some potential discussion here. I agree - - a prequel is the most likely scenario, but there could be some possibilities for a sequel with Marky Mark and a newly developed / expanded plot.