
The offenders stormed into the property on The Belper, near to the town centre, on January 13 in broad daylight at around noon.
An appeal has now been launched to find the men, with anyone who has information being asked by police to come forward.
People should use Live Chat on West Midlands Police's website quoting the crime 20/84093/23. To report anonymously, call the independent charity Crimestoppers on 0800 555 111.