I don't know. My background interviewer spoke with several people who were not on my list, to include people I worked with and for, neighbours from various places i'd lived ect.
On your personal security form it lists all those places for the past 10 years. They may just go out and do a door knock!
If you have questions or concerns, this is the time to make a disclosure to your file investigator, rather than have something come out.
Noneck