For my case
NIW VSC
I140 RD Nov 2003
I140 AD Nov 2004

I485 RD Dec 2003
First FP sep 2004
I485 tranfer to local office in New York- Dec 2004
I485 transfer back to VSC –Dec 2005
Get help from local Congressman for inquiry
VSC Ask for more evidence-July 2006
Told my Congressman that name checked has been cleared
Second FP –Oct 2006
Approval Notice-Dec 4th, 2006