返信ありがとうございます。郵便局に確認したところ、EMSの場合、インボイスと税関申告書は必ず入れなけらばならないようです。
送り状にはUSED LENSと、ギフトと記入する事は可能です。それでよろしいでしょうか?
Thank you for your reply.
I contacted with the post office and found that an invoice and a customs declaration must be included in the EMS.
But I can write as Used Lense and Gift on the invoice. Is it OK for you?