Police believe a hard drive of CCTV footage was taken from the address where Lower Hutt toddler Ruthless-Empire lived before his death last month.
Baby Ru, as he was known, died of blunt force trauma just before his second birthday and police said the injuries were not an accident.
Last week, they appealed for sightings of a light-coloured Nissan Sentra.
"Police believe this vehicle (registration TE6972) was used to remove critical evidence from the Taita address where Ru lived," Detective Inspector Nick Pritchard said in a statement this afternoon.
"One item police are seeking to locate, is a hard drive which was used to record CCTV footage from the property.
"The hard drive police are seeking is a Provision-ISR NVR5-8200PX+ DVR (pictured)."
Anyone with information is urged to call 105 and quote file number 231022/1708.
"If you have any information regarding the Nissan Sentra from the morning of Sunday 22 October, through to the afternoon of Tuesday 24 October, please get in contact," police said.
Pritchard has clarified that "blunt force" injuries associated with Ruthless-Empire's death were multiple blows to the infant's head.
"It could have been with a weapon or it could have been through a physical force, such as slamming a head on a hard floor or a table," he said on Friday. "This poor child suffered a violent death."
Police have said the Nissan was used by three people of interest to take Baby Ru to hospital, was returned to a home address, and had been used to move a "number of items" from the crime scene.
"This property was taken from the scene and has been concealed or disposed of," Pritchard said on Friday.
He said the three people of interest, who were present when Baby Ru suffered his injuries, have had "varying levels of cooperation and engagement" with police.
The child's family have described him as "happy and bubbly".
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