Please note that we (12GO) are not Japan Railways Group, we are an agency.
Once the reservation has been confirmed by our partner in Japan, we will receive your Exchange Order paper from them and it will be kept in Tokyo offices until you go to collect it. Alternatively, we will gladly send your boarding passes to your hotel in Japan.
And then you can use the exchange order paper and passport to shown when you redeeming the actual Japan Rail Pass Book at any JR main station or at The Airport (Narita, Haneda, Kansai, New-Chitose airports) in Japan.