Record 5100e3cdac1c42f49000f9956ebd8979

Note: "At 8:00, Sofia brought the heavy tablet over to the reception area." Note: "At 8:00, Petra was nearby and saw this happen." Note: "At 8:01, Sofia moved the heavy tablet into the archive room." Note: "At 8:01, Petra was nearby and saw this happen." Note: "At 8:02, Sofia brought the heavy tablet over to the atrium." Note: "At 8:02, Petra happened to be watching." Note: "At 8:03, Sofia moved the heavy tablet into the archive room." Note: "At 8:03, Petra was nearby and saw this happen." Note: "At 8:04, Sofia took the heavy tablet and placed it in the meditation room." Note: "At 8:04, Petra happened to be watching." Note: "At 8:05, she brought the heavy tablet over to the atrium." Note: "At 8:06, Sofia carried the heavy tablet to the archive room." Note: "At 8:06, Petra noticed this from across the room." At 8:07, Sofia brought the heavy tablet over to the security office. At 8:08, Uma moved the blue box into the atrium. At 8:09, Petra took the blue box and placed it in the cafeteria. At 8:10, Sofia reorganized some papers on the desk. At 8:11, Uma refilled a cup of coffee. At 8:12, Petra checked their email.

Where does Petra believe the heavy tablet is? Answer with only the location name (or 'unknown' if they have no belief).

archive room

(no reasoning captured)