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haha, plastic. Heat. You guys are funny. That's aluminum right there. this was dropped or hit by something, just not where you think it was. Look at the picture, the impact is over to the far left.
How do I know? I have one exactly like this, hit near the same spot. I'm glad they fixed it for you. Likely they just bent it back, like I did.

I think you are right ! I didn't notice that dent and it looks like the perfect pressure point for the damage I had to the drive...
 
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