不明白才問的，我在日本海關網站上看到下麵信息，不是你說的不用過海關

Do you go through customs when you leave Japan?

 

 

When leaving Japan, at the airport or seaport of departure, if you do not have “Record of purchase slip”, please present your passport at customs. if you have “Record of purchase slip(s)”, please submit the record of purchase slip(s) at customs.

https://www.customs.go.jp › summary

Procedures of Passenger Clearance : Japan Customs