The victim - a man in his 40s - told police he was punched as he opened the front door of his house in Auden Way, at about 7.30am on Saturday 28 May 2016.
A number of personal belongings were then reportedly stolen from within.
He is reported to have been accompanied by a second man described as being very skinny and wearing a blue zip-up fleece.
Anyone with information is urged to call the appeal line on 01843 222289 quoting reference ZY/17494/16.
Alternatively call Kent Crimestoppers anonymously on 0800 555111.
