Johnston also urged anyone who had seen the robbery or suspicious behaviour in the area to call the Kerikeri police station on (09) 407 9211 or Crimestoppers, anonymously, on 0800 555 111.
Victim Support spent Tuesday with the shop owners who were understandably unhappy.
''Unfortunately they've been victimised a number of times before, which is disappointing for the Okaihau community,'' Johnston said.
The last armed robbery at the store was in November 2016 when two youths entered the store armed with a long knife and a fence paling with a protruding nail.
An 18-year-old was arrested in Okaihau later that day after a local recognised him as he was running away. A 14-year-old boy was arrested a few days later.