We originally planned to include Japan but after some initial pilot testing we realized that the country was unsuitable for methodological reasons. Japan has a lot of small “police booths” where people can return lost objects. During our pilot tests, we found that Japanese citizens would not contact the owner but instead drop them off at a nearby police booth. This feature made it virtually impossible for us to assign individual wallets to particular drop-off locations.
I strongly suggest that you should re-design the experiment and do similar pilot tests in China. We have similar culture compared to Japan, and it is not fair to make such conclusions.