You can purchase the return envelope at Lawson or any post office, including airport post offices to return the products.
Please ask for a Letter Pack Plus (レターパックプラス). The price is 520 JPY.
You may request assistance at your hotel reception.
The return address is as below.
Og Sakuramobile
Zenken Plaza II 6th Fl.,
1-3-13, Nishishinjuku,
Shinjuku, Tokyo, Japan
160-0023
Please contact us and let us know about the incident as well.
Below is a photo of the Letter Pack Plus envelope.
