As ever, the clue is fairly ambigious, but the prize is 50,000 credits and three points toward your Series and Season progress rewards. That makes the Treasure Hunt important to complete.
Here's how to do it!
Blind Slided Treasure Hunt
Our hunt begins with the strange wording of the clue. "There are two star-shaped Dunas and a Desert Flyer sliding"...
At first it is hard to guess what this means, but the picture gives a helping hand. That's the Porsche 911 "Desert Flyer" in the dunes of Dunas Blancas, so that's a good place to start!
You'll also see that there is a new Drift Zone there to take on... It's all starting to fit together! Drifting in the Desert Flyer isn't easy, but thankfully the task isn't too tall. You need 75,000 points to get two stars on the new Las Dunas Drift Zone, and it's a pretty long zone so it should be easy enough.
Once you've done that, the area of the chest will pop.
Blind Slided Treasure Chest location
Thankfully you don't have to go hunting across the map to find the chest, it's really close by!
The chest itself is also simple to locate and collect this time.
Just head toward the Danger Sign and you'll find the chest at the bottom of the ramp!