Urn

When Qing Chen got to the office that day there was a small black envelope on top of his desk. What the hell? Before he got near his table he checked his immediate surroundings for anything else suspicious. A bomb perhaps? His secretary was not even on her desk yet. So who would've put this here?

Seeing as there was nothing else out of place, Qing Chen moved to his desk and looked over the envelope. There were no stamps or a return address in it. If someone placed it there, they did it themselves.

He flipped it with his short ruler. Nothing.

There was nothing on the cover. 

He took a book and placed it on top of the envelope and sliced the top with a small cutter. He didn't want to touch it as they may find some traces—a fingerprint, hopefully—of the sender. The paper inside was small and had no folds.

There were just three words in it.

I see you ;)