Those 3 are the ones the Russians caught being destroyed on camera.
The others were destroyed off camera.
Seeing that that nearly all the equipment losses of the Russians have photos & videos from Ukraine demonstrating the loss -- which makes it easy to prove the Russian tanks, truck, drone, aircraft, artillery, etc. losses. You would think that Russia would be able to provide some evidence of any claims about Patriot battery losses beyond the three (which were admitted to by Ukraine). Hint: They cannot.