The parents of missing South Australian four-year-old Gus Lamont have issued a plea for information about the disappearance of their son, releasing a new photo and video of him.

Gus Lamont went missing from his Oak Valley Station home in the state's outback on September 27 last year.

His parents, Josh and Jess, have today urged anyone with information about his disappearance to come forward, sharing their grief and devastation.

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"Our lives have been shattered, and every moment without him is unbearable," they said in a statement shared by South Australia Police.

"We are united in our search for answers about what happened to our little boy, Gus, who means everything to us… we know someone out there may have information. If someone knows what happened, we are pleading with that person—or anyone who may have seen or heard anything—to please come forward.

"Even the smallest detail could give us the answers we so desperately need."

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The new photo released of Gus shows the four-year-old in the back of the car next to a cattle dog.

He is wearing a navy shirt with a graphic design on the front, and long navy pants.

A 10-second video shows Gus riding on a child's bicycle somewhere on the property.

Earlier this month, SA Police declared Gus' disappearance as a major crime.

Police also said a person with close ties to the household, who is not one of Gus' parents, had been speaking to detectives but allegedly "withdrew cooperation." They are now considered a suspect.

Separately, police charged Gus' 75-year-old grandparent Josie Murray with firearms offences, but have clarified those charges are not linked to the toddler's disappearance.

Murray was bailed to appear in the Peterborough Magistrates Court on May 6.

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Police say forged medical files and fraud netted Flint more than $180,000.

Employee shareholders at an Aussie start-up are set for a big pay day after the company was acquired for $1.6 billion.

Digital health company Eucalyptus was acquired by American telehealth company Hims and Hers for $1.6 billion late last week.

The seven-year-old Australian business owns online weight loss services Juniper and Pilot, which prescribe GLP-1 medication similar to Ozempic and Mounjaro.

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Eucalyptus also runs other telehealth services including a fertility program.

The sale will lead to one of the biggest staff share pay-outs in Australian corporate history and give early-stage backers a big pay day.

The Australian Financial Review has reported the value of the shares under the deal, excluding its co-founders, was about $300 million.

The average employee participant is expected to pocket $420,000, with more than 100 to benefit from the sale.

The AFR reported former Eucalyptus chief commercial officer Joe Harris made more than $1 million from the sale.

Eucalyptus chief executive and co-founder Tim Doyle is in line for $163 million by 2029 if he hits several targets.

Early investors including Blackbird Ventures, Who Gives a Crap toilet paper founder Simon Griffiths and Co Ventures founder Maxine Minter will also benefit from the acquisition.

Doyle described the acquisition as a "full circle moment" for the start-up.

"When we were launching Eucalyptus, we drew inspiration from Hims & Hers," he said.

"Hims & Hers is the best-positioned business in the world to be the home for consumer health.

"This is also a moment to look backward and say thank you – to our investors, staff, clinicians, partners and our patients."

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