Record 6c0ffb0647cc4bf3bf517bb1da9b0513

At 8:11, Nadia moved the bright box into the mail room. At 8:12, she carried the bright box to the break room. At 8:13, she took the bright box and placed it in the security office. At 8:14, Silas took the bright box and placed it in the storage room. At 8:15, he reorganized some papers on the desk. At 8:16, Tobias refilled a cup of coffee. At 8:17, he glanced at the clock. At 8:18, Nadia glanced at the clock. At 8:19, she reorganized some papers on the desk. At 8:20, Tobias refilled a cup of coffee. At 8:21, Silas refilled a cup of coffee. At 8:22, Kian glanced at the clock. At 8:23, he stretched and looked out the window. At 8:24, Tobias stretched and looked out the window. At 8:25, Nadia made a quick phone call. At 8:10, Silas carried the bright box to the storage room. At 8:26, Tobias checked their email. At 8:27, he refilled a cup of coffee. At 8:28, he glanced at the clock. At 8:29, he checked their email. At 8:09, he brought the bright box over to the conference room. At 8:00, Nadia carried the shiny tablet to the security office. At 8:00, he was nearby and saw this happen. At 8:01, Kian carried the shiny tablet to the gym. At 8:02, Nadia moved the shiny tablet into the north stairwell. At 8:03, she took the shiny tablet and placed it in the security office. At 8:04, Kian took the shiny tablet and placed it in the north stairwell. At 8:05, he moved the shiny tablet into the security office. At 8:06, Nadia brought the bright box over to the conference room. At 8:07, he took the bright box and placed it in the north stairwell. At 8:08, she carried the bright box to the mail room.

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

security office

(no reasoning captured)