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如果回國之前沒有等到打指紋通知，也可以去約infopass去打那個sticker嗎？

-You may call USCIS to allow you to make the appointment to get the green card stamp on your passport at the USCIS local Office. The stamp is valid for one year. The problem is that if you leave before the fingerprinting, then you may have trouble to come back to conduct the fingerprinting after your green card expires.