It is true that Japan has different culture. Japanese prefer to give the purse to the police stations rather than contact the owners directly. So it is reasonable to neglect the research result in Japan.
Guess what？CHINA HAS DIFF CULTURE TOOOOOOOOOOOOOO！
More than half Chinese don't use email in their daily life！（In fact, according to the research on Chinese Internet by government that was published in 2018, More than 60% Chinese netizen don't use email for years.） Chinese prefer WeChat（an communication app like WhatsApp）and phone call.
Also，Chinese prefer to give the items they found to Lost&Found police station，the staffs of the hotels, banks, restaurants than contact the owners directly，which kinds of same as Japanese.
Besides, if the item they found is precious or valuable（worth a lot of money）, then Chinese prefer to stay at the place and wait for the owners, in case the owners come back but can’t find the items immediately.
In what universe can the researchers considered Japanese culture difference but ignored Chinese culture difference?! Especially when both of them are from Asia countries. Just like I can’t imagine a research have considered Canada culture but ignored U.S. culture. It’s reasonable and logical to doubt that the researchers are not racists.
Shame on you, Science, for letting this unreasonable article being published.