The chilling final message of an Australian tourist who has been missing in the US for almost a month has been revealed – as her family unveils a potential new clue. Sally Grace Contarino was last seen on CCTV on June 20 leaving a supermarket in Skye Canyon in northwest Las Vegas, as she was headed towards nearby Mount Charleston.The 26-year-old Melbourne woman was meant to board her flight back home to Australia the following day, but she never made it – and nobody has heard from her since.The tourist was on a solo trip and it has now been revealed by police she sent a final Facebook message to a male friend on June 19 shortly before she vanished, telling him that she was going to Lone Mountain for a hike, according to a Las Vegas Metropolitan Police report.Ms Contarino is a keen hiker and had shared plans to conquer Lone Mountain, which offers stunning views of Mount Charleston. It is not clear whether she planned to hike alone or with somebody else.Her sisters, Lauren and Amy, are both currently in Las Vegas to help in the search.“She was definitely on the mountain,” Lauren said on social media.“It’s confirmed she did make it for her walk up there. We don’t know if someone picked her up afterwards, it’s possible.”US police say they are investigating every lead in the search and have urged anyone who spots Ms Contarino to call 911 right away, as she “might possibly be in severe emotional distress and in need of medical assistance”.On Facebook, her family also shared another new clue, explaining that they had been unable to find a necklace that Ms Contarino always wore, despite her luggage being left at her accommodation. Gifted to the young woman by a relative, the citrine pendant on the silver chain was from luxury Bali-based jeweller John Hardy, making it very distinctive.“If Sally was wearing the necklace, someone may have seen it, found it, or come across it without realising its significance,” their post read.“It may also be worth keeping an eye on online marketplaces such as eBay, Facebook Marketplace, Poshmark, and similar sites.“Every detail, no matter how small, could be important.”Hundreds of dedicated locals in Las Vegas have volunteered their time to help find the missing Australian woman, along with online researchers who helped piece together a timeline of her disappearance.“Members are reviewing maps, bus routes, hiking trails, CCTV locations, weather conditions and publicly available information while working to separate confirmed facts from speculation,” the group Real Vegas Locals said on Instagram. Locals to the area have also been sharing first-hand knowledge of the terrain, neighbourhoods and hiking conditions.“Locals have been reviewing old dashcam footage, hiking areas Sally may have visited, following possible footprints, flying drones and sharing photos and information they believe could assist investigators.”The group helped obtain and verify footage that showed Ms Contarino outside a 7-Eleven on Boulder Highway on June 17. They later told news.com.au the stretch of road has long been associated with high levels of “crime, drug activity and prostitution”, making it one of Las Vegas’ most notorious corridors.“[The] corridor has long been known locally for high levels of crime, drug activity, prostitution, and other public safety issues,” a spokesperson said.“Its reputation is so well established that it has become part of Las Vegas culture, with countless jokes, memes, and social media posts referencing the area every week.“It’s widely regarded by locals as a place to avoid unless they have a specific reason to be there.”The group stressed there is no evidence linking Ms Contarino’s disappearance to the area, noting she vanished three days later after travelling towards Mount Charleston, but believed her presence there remained an important part of the timeline.A spokesperson for Real Vegas Locals said they first became aware of the footage after the man who filmed it posted in the group’s Reddit discussion page about the missing tourist.The content creator told the page he had already provided the original recording to Las Vegas Metropolitan Police before agreeing to let it be shared publicly to help raise awareness.Police confirmed that its Missing Persons Unit is aware of the video and investigators have the footage as part of their investigation.Administrators reviewed the original Ray-Ban Meta Smart Glasses file and confirmed embedded metadata showed it was recorded at 3.46pm on June 17, with GPS coordinates matching the Boulder Highway 7-Eleven where the interaction took place.The page said public interest in Ms Contarino’s disappearance had been unprecedented, with the video attracting more than 600,000 views in less than 24 hours, mostly from people in the Las Vegas area.The video, which has since gone viral, shows a young woman believed to be Ms Contarino standing outside a 7-Eleven on Boulder Highway in Las Vegas when she is approached by Instagram creator @epicDamianpov, who regularly uploads videos of himself approaching women in the city.Filmed using Meta smart glasses, the clip begins with the man walking towards the tourist as she shelters from the afternoon sun while smoking a cigarette.“Sorry, I saw that you were very beautiful and I was wondering if I could get your number, by chance?” he asks.Smiling politely, Ms Contarino declines his advances. “I have a boyfriend,” she replies.“Oh, OK. Are you waiting for him, or…?” he asks.“No, I’m just going to have a cigarette and go inside,” she responds.The brief exchange ends moments later as the man returns to his car. He later uploaded the clip with the caption: “Trying to pick up a beautiful woman.”According to police, she was using the WISE payment app to transfer funds and she owns an Apple iPhone.Las Vegas Metropolitan Police are urging anyone who may have seen Ms Contarino before she disappeared to come forward. She is described as having a slim build, brown hair and brown eyes. She was last seen wearing a grey or blue sweatshirt, denim shorts, black-and-white shoes and carrying a bag.Anyone with information about Sally Contarino or her whereabouts is urged to contact the Las Vegas Metropolitan Police Department