I'm going to go another way, instead of a box blade look at a land plane.
https://www.deere.com/en_US/product...dscape_equipment/land_planes/land_planes.page
https://tipsnotebook.deere.com/land-plane/
They won't dig like a box blade and will level dirt and stone much better.
The grader blade is good for snow removal and moving material but not great for leveling stone on a driveway.
I've seen these but never used one. My yard is rough as a corncob, mostly due to mole activity. How does one of these do in smoothing out a yard?