I received a CP2000 Notice from the IRS because I did not report gambling winnings. I need to report those winnings, and also deduct my gambling losses for 2020.

I do not have the W2-G forms from those winnings. The sportsbook (a legally operating State Lottery) has sent me a record of my monthly Win/Loss for tax year 2020. I need to deduct my losses against my unreported gambling winnings.