: The ledger contains a detailed record of the inmates Roy Cain used for his "side business" and, more importantly, the clients who paid for their services.
The "paper" you are likely referring to is , a critical document recovered at the end of the episode. The Importance of Cain's Ledger [S7E18] Roy Cain
In (Season 7, Episode 18), Roy Cain (No. 150) is the warden of Wallens Ridge State Prison who operates a criminal side-business by hiring out inmates for contract crimes. : The ledger contains a detailed record of
: After Reddington confronts and kills Cain, Agent Alina Park recovers the ledger from his home. This allows the FBI Task Force to identify and arrest the various criminals and organizations that had employed Cain's "extraction" teams. 150) is the warden of Wallens Ridge State
: Cain inherited this illegal enterprise from a long line of prison administrators, dating back to his great-great-grandfather at the Louisiana State Penitentiary.