Puneet,
I went through 2 applications for Canadian PR, both successful. Here is a summary:
First application for PR: May 2000
Finger prints obtained and verified by FBI: some time in June 2000
(I mailed the cards affter opening them)
Interview Waived: August 29, 2000
Medicals: October 26, 2000 (only me and my daughter, spouse could not go through medicals as we were expecting our son)
Added new born son on application: Nov 2000
Wife medicals: Jan 23, 2001
Landing documents recieved: April 2001
Validity until: Oct 26, 2001 (1 year from date of my medical exam)
My H1-B in the meanwhile expired on Sept 30, 2001 and I had sent it for renewal. I sent the passport for stamping to St.Louis and did not get the passport back in time to land by oct 26, 2001.
Returned the landing documents to Buffalo. Requested extension. Extension refused but Buffalo advised re-application. Re-applied in Dec 2001.
Interview waived in Feb 2002
Finger prints and FBI verification in Feb 2002. Again sent the cards after opening them. But as it turned out, Buffalo did not need them the second time.
Second medicals on Mar 13, 2002
Landing documents recieved during April 2002 with validity until March 13, 2003.
Planning on landing some time soon.
Point is: FBI documents can be opened. No problem.