That was a common problem back in 2016 and looks like it is still in force. The same thing happened to my car, the techs seem content to install 4 screws instead of 8. You need to go back to the dealer and have them order the screw kit, don't try to use alternate screws, and they will most likely take a few weeks to obtain.
If you had loose screws on any component up front, they were most likely installed and left loose. After 20,000 miles I see nothing coming loose on my car.
If you had loose screws on any component up front, they were most likely installed and left loose. After 20,000 miles I see nothing coming loose on my car.