Our flight early morning, the tax free office close in this time. Please advise.

Edith, if the tax free office isn't open 24 hours, then I think you should consult with the airport whether you can do the refund after you return to your country. Many Chinese people who successfully get their refund after they come back. I guess you might do the samething after you get back to your country. But you should confirm this with the airport.

Beijing airport: 0086-10-96158