Force weight may be lost.

Hello, today on the way to school (about 30 km country road) everything was still normal, but on the way home I heard a relatively loud vibrating and pulsating noise at a little less than 60 km/h. I then checked the rims on lost force weights after the drive home, but found no place that looks like there was a weight on it. Maybe I didn’t really look, I’m not sure what that looks like. (I just assumed that the S I checked the wheel nuts with a torque wrench at 120 Nm and they are all fixed. The noise comes regardless of braking, my guess is a weight. The problem is that I have no idea about it. What else could that be? And does this sound even fit to a lost weight or do you notice it quite differently? Thanks in advance.