Hi guys, i have a question. i am married to a USC, and i filed my I-130, I-485, I-765 and I-131 to the correct chicago lockbox(P.O. Box 805887 Chicago, IL 60680-4120) besides i live here in Mississippi. My checks were cashed, about 6 days after i sent in the applications. I received receipt notices for my I-130 and I-131. However, the receipt notices started with the letters MSC. Does that mean my case was sent to the Missouri Serive Center, or the National Benefits Center ( i hear its also known as MSC). i'm confused also because when i try to check the status online, it doesnt pull up anything. i thought recept notices started with EAC?....anyone please help with some clarification!!!