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Is this pellet skirt damage normal?

Occasionally, a tin will get very rough handling, and what you see is typical when it does. And it isn't just JBS. I got a tin of AirArms in .25 caliber earlier this year, and half the tin was bent up, and a number weren't even shootable. 

I can't speak for your dealer, but I would certainly mention it to them. If they won't replace it, at least ask for a discount.