A chunk like that missing from a piece that is supposedly a solid casting would give me pause. A chunk like that missing from a casting upon which I rely like I do the brakes in my car...
...I'd return them for a refund. Brake rotors matter too much to take risks.
To me this is one more reason to stay away from eBay brake rotors. The previous owner of one of my (now former) cars had put eBay slotted/drilled rotors on the car. The material itself was garbage. I never saw anything rust so fast in my life.
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