Detectives are seeking a man on suspicion of burglary.
The suspect is believed to have broken into a flat in Shenley Road in Borehamwood on October 14, between 6.30pm and 6.50pm.
He was disturbed by the occupants and made off in the direction of McDonald's restuarant.
Police have released CCTV footage showing a man they would like to speak to in connection with the theft.
He is wearing a red jumper and jeans and has black dreadlocks.
Anyone with information is asked to contact Detective Sergeant Alexandra Warwick via Herts Police non-emergency number 101.