我父母的绿卡现在需要延期。其中有一项要填写在那里领取的绿卡。因为已经是很多年了，当时别人带着去的，已经记不清在那里拿的了。帮他们办的律师已经过世，请问该如何查到。谢谢。
-USCIS only has 4 service centers, TSC, NVC, CSC, VSC. Just guess one of them based on your parents's resident address when they applied for the GC. Also, you can find some information from the surface of the GC. Just look at the lower part of the GC, there is a long line of numbers and symbols such as >>>, and you may find some something like LIN, SRC, EAC, WAC.
EAC – Vermont Service Center;WAC – California Service Center;LIN – Nebraska Service Center; SRC – Texas Service Center. So, if you find "SRC" in the GC, that means your GC application was filed to TSC.
Anyway, just fill one of the USCIS Service Centers there, and it is not big deal because USCIS can find your GC information in their system based on your A#.
