>>105793656
Lmao, it's called standard industry practice, the case manufacturers provide the needed screws.
If this matters so much to you, DYOR next time, and check if the board is including those screws.
https://rog.asus.com/motherboards/rog-crosshair/rog-crosshair-x870e-extreme/spec/
https://www.fractal-design.com/products/cases/meshify/meshify-3/black-solid/