[nolegsfngrpickn]

I haven't read through the entire posts, but I would assume if they have a super high quality camera to scan these instruments, then I would ask for copies of the part of the body in question; before they sent it to you, and after receiving it back. If they can't provide that, then there is no legitimate case (I think) placing the blame on you. Who's to say a worker didn't just bang it after receiving the return and right before snapping the photos?

Credit card company would be your next best thing to dispute the charge.