The incident is reported to have taken place at the business in Burgate at around 12.30pm on Wednesday 13 December 2023.
An investigation is being carried out by officers who have now released images of a man and a woman they wish to identify, who they believe may have information.
Anyone who recognises the people in the images or has any information that could assist with enquiries is urged to call 01843 222289, quoting reference 46/219534/23.
You can also contact Crimestoppers anonymously on 0800 555111 or by using their online form.
