I signed an American student visa in Guangzhou. The interviewer took my passport, visa invoice and mailing list. Did this pass? I didn't give any hints.

If the visa officer finally says that your visa has passed, it should be over.

If you are in Guangdong province, you should receive your passport and visa in about three days.

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I also went to Guangzhou on the 26th to sign a student visa. Finally, the visa officer left his passport, DS 160 and the express bill.

He didn't send me a clockwork or anything (my friend signed it in Beijing and said he would give me a note when it was over)

Then ask the visa officer before leaving: then I can go?

The visa officer said yes, so I think there are no cops in Guangzhou now. The visa officer said it was passed.

Then I received my passport and visa on the 29th.

Good luck ~