The man arrested over the disappearance of two elderly campers had resprayed his 4WD at least twice over the past seven years.
Jetstar pilot Gregory Lynn, 55, remains under police guard four days after his arrest in remote bushland in Victoria's east.
He had been plucked from the bush in the night by heavily armed police a week after police published an image of his distinctive blue 1997 Nissan Patrol.
A white Nissan Patrol parked outside Greg Lynn's home in 2016
A blue Nissan Patrol parked outside Greg Lynn's home in 2019
A beige coloured Nissan Patrol parked outside Greg Lynn's home in 2021
Jetstar pilot Greg Lynn remains in police custody four days after his arrest
That vehicle had been resprayed to a camp beige colour sometime over the past year as police closed the net on its 20-month long investigation into the disappearance of Russell Hill, 74, and Carol Clay, 73.
The secret lovers have not been seen since sneaking away for a trip to Victoria's remote Wonnangatta Valley on March 20, 2020.
Special operations group officers took down the Caroline Springs man on Monday afternoon after tracking his movements and flying into remote bushland north of Sale.
Earlier this month, police released images of a blue four-wheel-drive - believed to be a mid-to-late-1990s model Nissan Patrol - taken by a CCTV camera in the area at the time the pair went missing.
Witnesses had reported a number of sightings of the vehicle.
Although police released a detailed photo of the vehicle, it appeared to have its registration plate digitally altered, suggesting they knew exactly who owned the vehicle.
Google images show Lynn's then white Nissan Patrol parked outside his Caroline Springs home in 2016.
By 2019 - the next available image - it can be seen parked in the driveway, but this time it's blue.
Fast forward to June this year and the vehicle is again pictured in the driveway in the same beige colour it was upon Lynn's arrest.
The mid-1990s model Nissan Patrol (pictured) is now central to the investigation because painstaking video analysis has managed to account for every car exiting the remote valley that weekend - except the blue 4WD
Russell Hill (pictured, left) and Carol Clay (right) are believed to have been murdered during a camping trip
Mr Hill's white Toyota Landcruiser (pictured) was found with minor fire damage at their burnt campsite near Dry River Creek Track in the valley on March 21
Lynn was arrested around 5:30pm on Monday, and remains in police custody in Sale awaiting his fate.
It is understood police likely knew Lynn's exact location after releasing specific information to the public on his alleged vehicle last week.
Detectives at the time refused to say whether a CCTV camera atop Mount Hotham had captured the vehicle's registration plate, but it now appears certain it had.
Homicide squad detectives no doubt had the 55-year old under heavy surveillance for weeks, if not months.
Lynn is understood to have driven into the bush after a fight with his flight attendant wife Melanie.
On Sunday afternoon, surveillance footage showed Lynn welcoming a new resident to his Caroline Springs street in Melbourne's west.
The CCTV video showed the avid outdoorsman in an Akubra-style hat walking towards the neighbour and giving a compliment about his car.
On Thursday, police revealed they are yet to track down the Lynn's trailer.
Detectives believe the silver-coloured trailer was sold last year between March and July and have issued an appeal to anyone who bought one at that time matching the description to come forward.
The 4WD (pictured in a police sketch) has roof racks, side steps, off-road tyres and a bulbar. The box trailer is 'fairly standard' but has been fitted with 'off-road wheels'
All white: A white Nissan Patrol parked outside Greg Lynn's home in 2016
'If they've received one or purchased one and... they don't absolutely know who they purchased it from... there might be something suss about it - if they could contact Crime Stoppers that would be fantastic,' Chief Commissioner Shane Patton told Melbourne radio station 3AW on Thursday.
Commissioner Patton confirmed Lynn was spoken to by police previously before his dramatic arrest.
The Victoria Police boss stressed there was 'no urgency' to lay charges against him, noting a person can be held in custody for 'a reasonable time' with no set limit under the Crimes Act.
'We're not rushing into anything here,' he said.
'This is the most complex
