The final case contains 6 ID badges - that of the Pilot, the Co-Pilot and the Flight Attendant, as well as those of 3 TSA Agents that were working the day of the flight.

 

The ID badges show that one of the TSA Agents has the same last name as the Flight Attendant, implying that they are sisters, which explains how the Flight Attendant was able to sneak the chloroform onto the plane.