Well I already picked up a replacement, and it's on the way. I figured that grinding it smooth would help and I originally thought it was usable too a first glance. When all of the early responses said no, I found another and got it with free shipping. we'll see how it goes.

As for how some type of packing material would help prevent this, think of even using newspaper. If you pack the boxes with newspaper on both sides of the rotor, then if you were to drop the boxes, it keeps them from being able to bounce around inside the boxes and clang into each other. And it also keeps the weight of the rotor spread out so it can't center on one spot. Think of what would hurt more, a 50lb box sitting on your thigh, or a 50lb wrench balancing on end on your thigh. One the weight is centered in one spot, the other it's spread out. I think it would have helped.

Regardless, I have a new on the way, and I'm okay with the outcome