They advocate a personal collection log, but do not insist your personal collection is logged in. If you are planning to acquire or dispose of personal weapons thru your FFL then log them in "from owners personal collection" or "transferred to owners personal collection". If your personal guns intermingle with the business guns, they advise to hang tag them "owners personal collection".
Personal firearms record
Here is a more definative answer: Page 7
"The regulations provide that prior to commencing a firearms
business, a licensed dealer shall inventory the firearms
possessed for the business, and shall record these firearms in
his or her bound book. 27 CFR 478.125(e). Accordingly, if a
dealer possesses firearms that were acquired prior to obtaining
his or her license, and which are possessed for the business,
the dealer is required to include these firearms in the records
prior to commencing his or her business. This would include
all such firearms that the dealer intends to sell at some future
date. However, there is no obligation to record the acquisition
of personal firearms that the dealer obtained prior to receiving
his or her license, as long as he or she does not intend to sell
such firearms. Please note however, that such firearms must
be kept apart from the dealer’s business inventory of firearms.
https://www.atf.gov/firearms/docs/newsletter/federal-firearms-licensees-newsletter-february-2011/download