Remittance refund procedure:

Overseas individuals who have not used up the original RMB exchange can exchange it with their valid identity documents and the original China Bank exchange memo. The validity of the original exchange memo is 24 months from the exchange date. For the exchange of less than the equivalent of $500 (inclusive) on the same day and the equivalent of 1000 (inclusive) on the day before leaving the country, you can handle it with your valid identity document.