Closed for Maintenance

So "Crystal" wanders into class late and asks to go to the restroom. She says she forgot her pen there. I tell her, "fine," and send her on her way.

She arrives (several minutes) later.

"Did you find your pen?"

"No, they were cleaning the restroom, and the custodian told me to go to the other hall. Well, I went. And I looked, but my pen wasn't there."