A 400-year-old painting unearthed in the Blue Mountains and long thought to be a copy may be worth up to $5 million after art historians confirmed it was a 17th century Dutch masterpiece.

https://amp.smh.com.au/national/once-in-a-lifetime-discovery-400-year-old-dutch-masterpiece-discovered-in-the-blue-mountains-20220412-p5ad07.html

There is a bit more background in the Dutch article on the discovery.

Kunstwerk in Australische herberg blijkt van Nederlandse schilders

https://nos.nl/l/2425474