Today's mission: Identify the party responsible for this and report him or her to the relevant local police station. Bonus points for anyone who comes up with the scribblers weblog, QQ number or similar info.
It's a 1999 note, and it may have spent some time making its way from the scene of the crime to Beijing, so the culprit may have moved on. Do not let this stop you. Do not give up. Do not lose heart. Justice must be done.