Mr Huston said he was standing on the shop floor when the incident happened.
The Four Square supermarket opened in 2013 and won the Emerging Business Award and Retail Business Award at the weekend.
Rotorua police Senior Sergeant Geoff Barnett said the offender went into the store "grabbing the till box before running back out of the store without confronting anyone".
He said police were looking for a maroon Subaru or Mitsubishi sedan in relation to the incident and if anyone saw a car fitting that description around Edmund Rd at the time of the theft, they should contact police.
Mr Barnett said there had been a similar incident at another store, but at this stage not enough information was available to say whether they were connected.
- Anyone who has any information about the theft should call police on (07) 348 0099.