The equipment, used to copy peoples card details, was discovered on a machine in Sawtry Post Office, Green End Road, at about 8pm on May 1. It was spotted by a customer who reported it to the shopkeeper. It is not thought that anyone used the machine while the device was in place. Police investigating the matter have this afternoon (Friday) released the images of two men. Detective Constable Dianne Booth said: We are very keen to speak to these men as we believe they might have important information which could assist our investigation. INFORMATION: Anyone who can help should call DC Booth on 101 or Crimestoppers, anonymously, on 0800 555111.