When mine snapped I heard it. Like a big stone hitting the underside of the car and a bit of a twang noise. Got home and looked through the 108 spokes and saw the clean snap on the very end of the spring.
The ride height is very susceptible to uneven ground, and can be off by 10 mm side to side and be within OEM tolerance, so best bet is to jack up car and remove the wheel, then you'll see the spring. Typically the very top or bottom 2 inches snaps off.
If you have 108 style or similar alloys, then get a torch and look between the spokes, you'll likely see the spring, whether intact or not...
Not a big deal if you find one snapped. Very common!