Got emails from USCIS this afternoon informing both my wife's and my case have been approved.
ND 10/3/2002.
1FP 11/2002
2FP 8/12/2004 (me), 8/16/2004 (wife)
My, the derivative applicant, 2FP notice came more than 3 weeks later than my wife's.
The applicant switched jobs twice and moved from Chicago to Wisconsin.
Thank all of those who'd given us advice. For those still waiting, your day will come soon.