Four men, wearing balaclavas, smashed their way into a garage in St Ives on Thursday February 21.
The incident happened at around 3.30am at the Hemingford Esso Service Station, London Road.
The men used a sledge hammer to break in before stealing a safe containing case.
The men are white and were wearing gloves.
DC Karin Peters said: “I am keen to hear from anyone who witnessed this incident or who has information about the men responsible.”
Anyone with information should call police on 101 or Crimestoppers, anonymously, on 0800-555111.