A gang of four men forced their way inside a Desborough supermarket before making off with cigarettes.
The break-in happened just before midnight on Thursday, April 3, at the Co-op in Braybrooke Road, Desborough.
The gang are all described as white men wearing balaclavas.
One was 5ft 10in with a medium to heavy build, another 5ft 6in with a slim to medium build, possibly carrying a sledgehammer.
Another had a heavy build and was carrying what looked like a crowbar, and the fourth was about 6ft with a slim to medium build and light or ginger hair.
Police would like to speak to anyone who may have witnessed the incident.
Witnesses or anyone with information is asked to contact police on 101 or Crimestoppers anonymously on 0800 555 111.