Officers appealed to the public for information as part of their investigation into four separate incidents that are alleged to have taken place at pubs in Ashford, Dover, and Dymchurch between October 2016 and April 2017.
Officers have said they believe those responsible may have also committed six other similar offences at pubs in Bedfordshire, London, Surrey and West Sussex.
A spokesman for Kent Police said: "We would advise pub-owners to remain vigilant and urge staff and customers to report any suspicious activity to their local police force.
"A good quality CCTV system is invaluable in helping police identify suspects of crime, but it is equally important to regularly check it is fully operational and that staff know how it works and how to download images from it at short notice."
Lines of enquiry
Officers have been following a number of lines of enquiry and are now able to release CCTV images in connection with one of the most recent thefts at a pub in Biggin Street, Dover.
Anyone who recognises the men in the images is urged to call the appeal line on 01843 222289 quoting reference ZY/13386/17.
They can also call Kent Crimestoppers anonymously on 0800 555111.