Every where you have lived, for the past N years. The number of years depends on the level of clearance, but it's as high as 15 years. For this purpose, I'd make it all the way back to graduation from high school. Gaps in residency or employment history are considered suspicious, and the investigating officer must fill in those gaps before approving the application.
However, I'm not suggesting that someone specifically approve/disapprove the candidates' "application" -- just that the information should be provided, and any gaps will become obvious to interested parties.
I used to run those clearances long ago. VERIFICATION of the birth certificate was a must and in most offices they would let you review the official record pages. No way some Ruskie slipped through as long as the baby did not die and someone else pick up his ID..of course that was why one needed to do the neighborhoods and grammer schools in some cases.
In Ozeros case, it would not be case closed, no derog.