Jack was exploring the Bunker when he found a hidden compartment that held a dufflebag. He brought it to the war room where Dean, Sam, Gabriel, and Castiel are. They open it and find photos of people who don't appear to be members of the Men of Letters. They find a group photo with names on it and Sam researches them.

They you, the only living member of the group in a house that's not too far away from the Bunker's location. So they all pile into the Impala and drive off. They arrive and find you sitting on the back porch. Jack stays close to Dean and Castiel as they approach.

You lift your head and watch them, cane in your hands with legs crossed. Sam holds out the group photo.

Sam: Sir, do you recognize this photo?