To go through security clearence can required up to 15 years of this information plus addresses at all locations where you have lived for more than 90 days plus a unique person who can be contacted who knew you at that location.

You will NEVER be able to have all this data in most circumstances. Prepare it as best you can. If the manager is gone, leave the company phone number. If the company is gone, give the phone number for the new company or lawyer handling the closure, etc.

Do your best and move on. Chances are they just want to call one or two of them and make sure you're not mulching babies in your spare time.