< Acceptable written proof >
(1) Copy of your Overseas Residential Registration issued by the embassy or legation of Japan in the foreign country where you live (limited to an Overseas Residential Registration with a date of acceptance at least 10 years earlier)
(2) Certificate of Overseas Residence issued by the embassy or legation of Japan in the foreign country where you live (limited to a Certificate of Overseas Residence with a date at least 10 years earlier as the date on which your address (or place of temporary residence) was established as your present address)
(3) As a special case limited to the USA, Brazil, and Canada, the Permanent Resident Card issued by these 3 countries can be used as written proof until further notice (limited to a Permanent Resident Card confirming your stay in the relevant country for 10 years or more).
More information
http://www.japanrailpass.net/img/about_jrp/file/conditions_en.pdf
If you meet Condition 2, you are able to place an order through our online system, however, you will also need to fax or email a copy of the document that makes you eligible. Agents will contact you by phone or email during business hours to confirm your understanding of the need of a copy and to notify you when such documents have been received. Please be advised that until we receive a copy of the necessary documents we will not be able to fully process your voucher. We advise that you send in your order at least 2 weeks before your departure date to allow for necessary shipping.