I am always polite to them, after all, who keeps that school clean? And yes, I did ask them, but they didn't know anything. I know it was stolen, there's no way a cleaning lady would throw away something by mistake but still managing to write thanks on the paper, right?
A classmate just gave me a pencil that looks exactly the same, and I love it. I will still take back that one if I ever find it, though.