Are you a residence in the following state?
File in the Nebraska Service Center if the place of permanent employment is in:
Alaska, Arizona, California, Colorado, Guam, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Montana, Nebraska, Nevada, North Dakota, Ohio, Oregon, South Dakota, Utah, Washington, Wisconsin, or Wyoming
I am CA resident. I filled I-140 and I-485 to NSC on July 2.I-140 approved at NSC, but no receipt notice for I-485. I-765, and I-131.
See attached the link.
http://www.nafsa.org/regulatory_information.sec/regulatory_document_library.dlib/fees_forms_and_processing/direct_filing_of_forms