Napier Port chief executive Todd Dawson said when conditions eased Monday afternoon and Tuesday morning, Napier Port sent out its survey boat, pilot boat and a chartered fishing vessel to survey the seafloor near where the container entered the water and the length of the shipping channel.
After the all-clear was given that there were no navigation hazards, shipping resumed yesterday before noon.
Dawson said given that time has passed with no sightings, there was a chance the container had been punctured and had sunk.
The port's marine team, including the tug and pilot boat masters, will be actively watching for the container until it is retrieved and warnings will remain in place for the local boating community.
Hawke's Bay harbourmaster Martin Moore said the region experienced large swells, with the largest reaching 8.5m. Although that may seem high, he said it was fairly regular for winter storms.