Dyfed-Powys Police is appealing for witnesses following the theft of front and rear number plates from a white Ford Escort van last Saturday.
The vehicle was parked in a field near Coed-y-Dinas during the Agricultural Machinery Show and it is believed the plates were taken sometime between 9:00am and 1:00pm that day.
Police would like to speak to any farmers or visitors who attended the show as they may be a vital witness.
If you saw any suspicious activity, please contact Dyfed-Powys Police on 101. Or call Crimestoppers anonymously on 0800 555 111.