我交I140 and I485 concurrent， 在NSC 网页招到两个地址：第一个是邮寄地址：U. S. Department of Homeland Security
U. S. Citizenship and Immigration Service
Nebraska Service Center
P.O. Box 87485
Lincoln, NE 68501-7485
第二个是说如果是If using overnight delivery by any private service provider, send your package to:
USCIS
Nebraska Service Center
850 S Street
P.O. Box XXXX
Lincoln, NE 68508
我要用Fedex overnight, 请问寄过的朋友， 你们用的哪个地址呀，谢谢大家了