8老師及各位大俠：父母以前有綠卡，十年前回國未再來美，三月份 file I-407 放棄綠卡，但至今未收到回複。如何可以查詢確認綠卡已注銷？
-USCIS will send your parents the I-407 approval notice (i.e., endorsed (processed) I-407) when it is approved. This endorsed I-407 is the proof of their abandonment of green card. They can provide the copy of it when they apply for a non-immigrant visa (e.g., B2 nisa) or green card again. The process of I-407 normally takes about two months or more (not include mailing time to or from outside of the United States).
若現在申請B2會有問題嗎？多謝指教！！！
