For close to a decade this baggy green has sat along side the other greats' caps of the game.
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Bradman Museum's curator Andrew Summerell has definitively shut down those rumours.
"We have had Langer's cap in our collection for close to a decade," Summerell said.
"It's come through Justin and his management. He has always been very clear where it is. Some players tend to be a little forgetful with what they do with their caps when they have loaned them somewhere.
"Justin has always said his cap was here at Bradman, and it's here for a purpose."
Langer's cap has been worn in over 105 Tests between 1993 and 2007. It has never been washed and everything it has accumulated over its playing time is like a badge of honour. It's a cherished piece in the Bradman Museum and they treat it accordingly.
"With our collection we have a mixture of caps that have been either donated or on loan," Summerell said.
"Justin Langer's cap is loaned to us. Players like to loan their caps to us because they know people like to see them. They also know that we will take care of them.
"The players, especially from Langer's era have huge pride in their caps."
It's not the first time these kind of auctions have popped up claiming to be selling the original baggy green of a famous player.
"We've heard stories like this and it's always a bit of a laugh," Summerell said.
"The players are happy their baggy greens are here.
"When that cap came up for auction, that's when the questions started and Justin, through his management, asked some questions.
"We confirmed to him we have the cap. We took photos of the cap's innards because he's inscribed messages [of a song verse] and signed the inside.
"Justin was more than happy with that evidence, although a little distressed that there are replicas claiming to be his original cap."
The auction that claimed to be selling Langer's cap changed its tune after word started spreading that there was a possibility of a piece of cricket history up for sale.
"The auction house of that replica initially said it was Langer's," Summerell said. "Then it changed to a hat he signed. Now it's been completely taken off auction. It has completely disappeared.
"My career is based on ethics and reputation. So if I say things that are found out not to be true, especially major things, people won't believe me next time I have something to say.
"The difficulty with these auction houses is that they have a different perspective to us. They're looking to sell things for money. I officially can't work with objects for money. I legally can't give an evaluation for money.
"Those things may seem a little archaic in these days but they're very important to us.
"It means as a professional museum, we're looking at the historical significance, not the financial gain."
Langer retired from Test cricket in 2007 after Australia won back the Ashes. He was appointed coach of the Australian team in May 2018.
He became a Bradman Foundation honouree with his long time Test opening partner Matt Hayden in November, 2018.
Bradman Museum released this statement on its purpose and stance.
"The Bradman Museum exists to collect and preserve Australia's and the world's cricket heritage and to share the collection and our acquired knowledge to all our visitors and beyond.
"The Bradman Museum has become trusted by players, collectors and the public as a place that honours the spirit of cricket through exhibition and knowledge."