回複：f1申請批準，但舊的I－94卡原件沒寄回，不知道為什麽？需要申請取回嗎？請指教，多謝！！

You do not need that I-94 anymore because it was replaced by the new I-94 with your F1 approval notice. But you should keep the photocopy of the old I-94 for future possible use to prove your valid status during this period of time.