Where to mention forfeited 401k contribution made by employer?

pcb

I resigned my previous employer in middle of the year, and they forfeited my few thousands of 401k contribution made by the employer as per their policy. Thereafter employer bank sent me distribution statement mentioning that money as forfeited money. They did not send any 1099R and not going to send. Where to indicate this forfeited money in tax filing. Any guidance is appreciated.