A dealership can cut keys using the VIN and program them for you. It won't be cheap and some dealers won't bother with keys unless they are purchased through them.
If the 5/60 warranty is bumper to bumper then every problem that arises should be covered. If it's just a power train warranty, then no.
I've never heard a high pitch noise on mine. That might be worth looking into to see exactly what it is. It might be nothing to worry about.
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