You simply use the 1099-DIV interview entering the information "as if" you actually received one.
If you look at the actual Schedule B where interest and dividends are reported
https://www.irs.gov/pub/irs-prior/f1040sb--2019.pdf
you'll see that there's nothing there that indicates whether you received a 1099-DIV or not. It's just a listing of payers and amounts.
