The six o'clock alarm

It was the cleaners who called the National Guard, long before the first MP arrived. The wing was in the middle of a move, with boxes everywhere and half the staff rushing about. Place each person in their room, one per row, one per column. Whoever is left alone with the evidence is the one you're looking for.

Suspects

• Amélia, the head cleaner: She raised the alarm. She says she only noticed because it wasn't the usual mess.
• Bartolomeu, the logistics trainee: He joined logistics three months ago and already knows the building better than he should.
• Camilo, the removal van driver: He's been doing removals for twenty years and swears he had never seen that particular box.
• Delfina, the longest-serving employee: She's worked there so long that nobody notices when she's around.