No, once an Exchange Order (voucher) has been exchanged for the actual Japan Rail Pass in Japan, it is 100% non-refundable and cannot be changed or canceled.
This is a strict policy set by the Japan Railways (JR) Group, and the following rules apply without exception:
If you have not yet exchanged your voucher and it is still within its validity period, please refer to our standard refund policy for unused vouchers.
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