Between Friday, June 17 and Sunday, June 19, number plates were stolen from a Renault van parked on Pontygwindy Road, a VW Crafter panel van on Standard Street, Trethomas, and a Renault Scenic and Renault Clio parked on Coed Y Brain Road, Llanbradach.
Anyone with information can call Gwent Police on 101 or Crimestoppers on 0800 555 111.