Nothing to worry
Hi Guys ,
Ignore Shantanu's posting. I guess this guy is scaring. Cases are transferred to local INS offices for various reasons. It does not mean that your case has some issues.
Its a way of quality control. Don't worry, officer are very friendly and helpful. They just want to make sure at the most that you have a job offer and probably wants to see some previous pay stubs. Search some of the postings here you'll know everyone has a pleasant experience and got approved. INS cannot reject GC's unless you have a criminal record, or medical reasons.
Cheer up
3DM