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You’re right; it is the cover that goes in that spot when you don’t have the charging pad. Actual p/n is N1WZ-26045C22-AB. MSRP is $12.83 at the end of March. Might have gone up on June 1st.
You’re right, there’s nothing in the steering wheel itself to detect contact or input; the input data probably comes from the SAS (steering angle sensor) mounted on the column just below the steering wheel.
There's no pressure sensors or capacitive sensors in the steering wheel; it all happens...