All you can do is have a really close look at everything around that area , even using a pry bar to check for movement etc.
Remember if you only jack up one side it will pre load the anti roll bar inner bushes and the drop arm links that join the bar to the suspension strut, stopping you from feeling any play, so it needs to be supported equally both sides.
If trying to feel play in the ball joint on the outer end of the bottom wishbone it needs to be hanging free, not on axle stands unless on chassis.
Over the years I have had everything from the wheel nuts loose, hub nut /bearings loose,inner wishbone bushes worn, inner wishbone bolts loose, inner wishbone bolts tight but still movement as not securing wishbone to subframe/chassis(as in bolt seized but not pinching wishbone bushes tight in frame), as mentioned springs broken, spring cup rusted away, spring top mount bearing failure, etc., etc.
Then with antiroll bar links even if tested on level ground sometimes play may only be noticed with hand on the joint and some rocking the car side to side, inner anti roll bar bushes may have movement again only found with a pry bar to show it.
Brake calipers loose in support bracket , brake sliders worn, etc.
Other times wear may only be seen when an assistant is shaking the road wheel whilst you are checking the suspect part.
I am sure there are other things I have forgotten others may suggest, even things like bumper support brackets mountings for the engine can cause noises too.
As an apprentice many years ago we spent ages trying to locate a slight rattle on a Mk 1 Ford Cortina, certainly not a car as sophisticated and quite as todays vehicles, the owner was insistent and one day we heard the noise just barely that he was concerned about and was able to trace it , a metal choke cable going through the metal bulkhead, a simple rubber grommet was all it took in the end, something I am not sure it even left the manufacturers with.
