A gang of four masked men forced their way into a supermarket before making off with cigarettes.
The break-in happened just before midnight on Thursday, April 3, at the Co-op store in Braybrooke Road, Desborough.
The gang are all described as white men who were wearing balaclavas.
One was descrobed as about 5ft 10ins tall with a medium to heavy build, another 5ft 6ins with a slim to medium build, and who possibly carrying a sledgehammer, said police.
Another had a heavy build and was carrying what looked like a crowbar, and the fourth man 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.
Contact Northants police on the 101 number or Crimestoppers, which is free and anonymous, on 0800 555 111.
Story by Alex Blackwell
Follow Alex on Twitter, @BlackwellHarb.