Parent 'thought it was a joke' upon hearing year 3 NAPLAN tests stolen

NAPLAN test papers of dozens of school students from Melbourne's inner-north are missing. (ABC News: Kathleen Dyett)

NAPLAN tests of about 70 primary school students from Melbourne's inner-north are missing after a the van carrying them was stolen on the way to exam markers on April 1.

The tests contained the names, dates of birth, year levels and schools of the students.

Victoria Police is still investigating the theft and there have been no arrests.

The sensitive details of dozens of primary school kids are still missing after a delivery van carrying completed NAPLAN tests was stolen on the way to exam markers.

The ABC can reveal that about 70 students at two primary schools in Melbourne's inner-north, Princes Hill Primary School and Carlton North Primary School, are now victims of an analogue data breach.

On March 17, a FedEx van was stolen from Pigdon Street in Carlton just after school finished and was later recovered around the corner on Mary Street, but the tests remain missing.

Among the details now in the wind are the names, dates of birth, year levels and schools of grade 3 children who answered a writing prompt about a rock.

A school principal said there was a chance that the writing completed by the children contained personal information. (ABC News)

The ABC understands the courier van was subcontracted by Pearson Australia, which has a $4.4 million contract to print, produce, deliver and collect the tests in Victoria.

Students were later given the option of re-sitting the test, which is administered by the Victorian Curriculum Assessment Authority (VCAA).

A VCAA spokesman said that when it became aware of the theft, it took "immediate action" to ensure families were notified and could access support.

"While the police were able to recover the vehicle, the materials inside it had been removed and have not since been located," the spokesman said.

But while the data breach was reported to the Office of the Victorian Information Commissioner on March 27, affected families were only informed 15 days after the incident, on April 1.

"We were told on April Fool's Day so we thought it was a joke to begin with," said one parent from Princes Hill Primary School.

"We didn't hear anything from VCAA, just from our principal. We got one email saying they'd been stolen. There was no real follow up beyond that.

"I know it's not VCE results but it's still little kids who have poured their heart and souls into their stories, and everyone knows what it's like to redo your work. It's pretty annoying."

Students from two Melbourne primary schools