Record abb516087f3f43fdab91952575abea50

At 8:00, Ivo took the large folder and placed it in the observation deck. At 8:00, Elena was nearby and saw this happen. At 8:01, Vera took the large folder and placed it in the atrium. At 8:01, Elena noticed this from across the room. At 8:02, Vera took the large folder and placed it in the front office. At 8:02, Elena noticed this from across the room. At 8:03, Ivo moved the large folder into the gym. At 8:03, she noticed this from across the room. At 8:04, he brought the large folder over to the atrium. At 8:04, she happened to be watching. At 8:05, Vera carried the large folder to the photo studio. At 8:05, Elena noticed this from across the room. At 8:06, Ivo carried the large folder to the atrium. At 8:06, she noticed this from across the room. At 8:07, Vera brought the sturdy box over to the photo studio. At 8:08, Ivo brought the sturdy box over to the north stairwell. At 8:09, Elena brought the sturdy box over to the conference room. At 8:10, he carried the sturdy box to the observation deck. At 8:11, Vera moved the sturdy box into the east wing. At 8:12, he moved the sturdy box into the north stairwell. At 8:13, she brought the sturdy box over to the gym. At 8:14, Elena reorganized some papers on the desk. At 8:15, Vera refilled a cup of coffee. At 8:16, Elena checked their email.

Where does Elena believe the large folder is? Answer with only the location name (or 'unknown' if they have no belief).

atrium

(no reasoning captured)