Authority member Rosemary Monaghan found Progressive Enterprises, which owns Countdown, had acted fairly and reasonably when deciding on and implementing the dismissal said and his sacking was justified.
Countdown spokesman Luke Schepen today said any claim that what Mr Dick did was standard practise at Countdown was false.
"The safety of our team members and our customers is an absolute priority. On the rare occasion we find anyone compromising this commitment we take swift and immediate action, and have done so in this case.''
Countdown was pleased the authority had taken the same view, he said.
Mr Dick refused to comment on the finding.
The Ministry of Consumer Affairs, on its website, said a 'best before' date on food was used to give the consumer an idea of when the food should be eaten by.
After the 'best before' date it is likely the quality of the product could begin to change.
Food marked with a 'use by' date should not be used if the date has passed.
It is illegal to sell food with an expired 'use by' date.