回複:I-94卡出境時沒有交回怎麽辦?

I don't think there is a place for you to turn in your parents' I-94 cards.

It's better for them to keep their air tickets / board passes as proof of when they left.

http://web.wenxuecity.com/BBSView.php?SubID=immigration&MsgID=346811

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