Barossa Police currently forensically examine food contents and packaging after they were notified on Monday that a customer had found a nail in a strawberry punnet.
The punnet had been purchased on Thursday, August 15 at Gawler.
Police, who now await the results, revealed that the remaining stock was examined and no other items were found and they are not aware of any other such reports.
Investigations are ongoing and police have not ruled out accidental contamination.
Police stressed that responsible reporting from the public of this incident is vital to avoid generating unnecessary public fear or detriment to the industry.
SA Health have been advised.