Thieves stole an iPod, mobile phone charger and Sat Nav from a silver BMW parked in Pearce Close, Aylesbury.
They broke in through the front door of the car between 10.30pm on Tuesday and 2am Wednesday.
If you witnessed the incident, or have information which could assist the investigation, please contact PC Victoria Cooper from Aylesbury police station via the 24-hour Enquiry Centre on 101.
If you don’t want to speak directly to the police you can contact the independent charity Crimestoppers anonymously on 0800 555 111 or online at Crimestoppers-uk.org. No personal details are taken, information is not traced or recorded and you will not go to court.