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I-407，簽證官都沒怎麽看，也沒在上麵簽字或是蓋章就還給我媽媽了。不知道這會不會給進關添什麽麻煩。
-No problem. This I-407 equal to the receipt of green card abandonment. So, if she wants to apply for green card again, just provide the copy of the I-407.

綠卡也沒收回，也還給我媽讓她留著紀念。 lol。