All punnets have been recalled.
"We could be finished by the weekend", he said.
Lawrence also encouraged people to check strawberries before they are consumed.
"We are in the early stages of the investigation", he said.
"Police have spoken to the person who operates the farm and they are assisting us with our inquiries", he said.
However, on Friday, NSW Police added that the contamination might have affected four more brands: Love Berry, Donnybrook Berries, Delightful Strawberries and Oasis.
It comes after NSW mother Chantal Faugeras posted to Facebook images of strawberries she said were bought from a Coles supermarket on the NSW Mid North Coast on Tuesday.
"I now say given that there's been these additional incidents, unrelated to that particular product, my advice is to be ultra cautious and simply cut up those strawberries before consuming them".
He said police are "comfortable" that the issue with the "Berry Obsession" and "Berrylicious" brands had now been resolved, having been taken off the market.
"They rang me back not even five minutes later and said it was too late, he'd bitten into it and he had found a needle".
Contaminated punnets have been reported in supermarkets in the states of New South Wales, Queensland and Victoria.
Police have liaised with retailers to ensure that all stock is removed from sale.
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Australians have been warned to cut fresh strawberries before biting into them after several people found sewing needles hidden inside the fruit.
The health concerns over needles and pins found inside Australian strawberries are continuing to escalate with NSW police now warning up to six brands may have been affected.
Investigators have also now confirmed a fourth contamination incident as having occurred in a punnet of strawberries.
The disturbing discovery was made by a Coles employee who saw the risky object inside a punnet of strawberries at a shop in Gatton, west of Brisbane yesterday.
A thin metal object, possibly another needle, was found in a punnet in Gatton.
It's suspected the incident is a copycat attempt. She said that people can "chop them in half" if they remained concerned about the presence of needles.
Police believe they have contained the threat, which was first reported over the weekend.
The Queensland Strawberry Growers Association said it had reason to suspect that a disgruntled ex-employee may be behind the incident.
"I'm urging anybody who finds something within their strawberries to report to or telephone police link. We're not agreeing with that at all at this particular point in time; our investigation is still open", he said.
A nine-year old boy bit into a contaminated fruit but did not swallow.
You can report information about crime anonymously to Crime Stoppers, a registered charity and community volunteer organisation, by calling 1800 333 000 or via crimestoppersqld.com.au 24hrs per day.