Marlene's journal is an optional artifact in the Firefly tent on the sixth floor of St. Mary's Hospital. Walk to the far section of the tent marked with the Firefly logo and take it from the table on the left, next to the microscope.
A run of diary entries from Marlene's trip west to Utah and her weeks at the hospital, ending on the day Ellie is brought in.
Marlene believed Ellie never made it and blames herself for handing the girl to smugglers while she was wounded and her people were being hunted out of Boston. She feels judged by the other Fireflies and writes that she failed Anna. Then a scout reports a man and a red-haired girl near the bus terminal, she joins the recon team, and the last entry says Ellie is alive and the tests have begun.
Marlene's recorder 1
Marlene's recorder 1 is an optional audio artifact in an office on the sixth floor of St. Mary's Hospital. After the first flight of stairs, turn right, go through the open door on the right and pick it up from the desk.
Marlene's recorder 2
Marlene's recorder 2 is an optional audio artifact in Room 608 of the hospital's Pediatrics ward. After you enter Pediatrics and barricade the door, go into the room on the right and pick it up from the table against the back wall.
Stewart-Seume's Firefly Pendant
Stewart-Seume's Firefly pendant is the 31st and last pendant, on a desk behind a shiv door on the sixth floor of the hospital in The Firefly Lab. It belonged to Bryony Stewart-Seume.
Surgeon's recorder
The Surgeon's recorder is an optional audio artifact on the sixth floor of St. Mary's Hospital in The Firefly Lab. After the first flight of stairs, it is on the reception desk right in front of Joel.