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我原来邮寄材料是记得写的是下面这样的，请问我现在补材料（要求我补ETA-750B表），请问我应该怎么写，谢谢您

USCIS
Attn: I-140
P.O. Box 660128
Dallas, TX 75266

-Don't use that address you mentioned here. When USCIS sent you the RFE, they should have enclosed an envelop in the same mail, and asked you to put your response materials to that envelop and mail it to USCIS. Did you find that envelop?