Hi P.A., go to dictionary to have the term of "unnumbered". Shame on yourself! I can bet it with dropping 5 yuan at Tian'anmen Square. If it was untouched within 15 mins, I would loss 500 yuan. Literally, you are wrong if you don't pick up the dropped 5 yuan because of 丢那个脸. If you are not the owner of that 5 yuan, taking it will offend law. I sincerely advice you to go to countryside which has 70% of population in China for a time to experience how hard their livings are and how poor their education is.
Chinese is accustomed to attribute the causes of their offence to law to others' reasons. That's why our society lacks honesty today in China. That's why the conceptions of "wrong" and "right" are not build up in people's minds.