Only around 57% of people in China use Internet and we do not use email as often as WeChat. Usually, the lost is more likely to be picked up by cleaners and most cleaners do not know how to send an email. In my humble opinion, the wallets which used in research were more like trash:）. What's more, when you find a lost, you can hand over to community or police. When you lost something, you need to connect lost-and-found office of community or police station by yourself.