When an I-485 is accepted at the Service Center, requests for FD-258 FBI fingerprint checks, fingerprint fees, and G-325A consular background checks are made by USCIS. Responses to these requests come back to USCIS and must be matched up with the appropriate files held in staging. File Maintenance "file connects" these responses to the corresponding files.
My wife and I had our passports stamped after a 6 hour ordeal that started at 8:30 a.m. and ended at 2:30 p.m. Here are some tips based on what we experienced,
1. For an 8:40 appointment, get there before 8 if at all possible. They were not checking appointment timings, so people with 9/10 a.m. appointments were ahead of us in the line. All they care is that you have an appointment for that day.
We won a case for a Ph.D. in Accounting under the Outstanding Researcher and Professor Category. This individual had over nine years of teaching and research experience. He held a position as an Assistant Professor at a prestigious academic institution. He was noted for innovative and pioneering work in his field as well as significant contributions to accounting principles. This applicant was awarded for outstanding teaching each year from his students and fellow professors.
This applicant provided a 5-year contract for services in a medically underserved area, a copy of his J-1 residency requirement waiver, letters from the Health and Human Services office in his area requesting his services, documentation to reflect the statistics of the health professional shortage in his employment area as well as copies of his license to practice medicine.