This type of defect happens when books are stack on top of each-other for a long period of time and when books are uneven in the the box stored without cardboard backers and the weight of the stack sits against other books in the back of the box.
Tune in SUN. to see if this was corrected / or was it just to far bent ?
Thanks for the look guys and gals ! and as always any questions about my service don't hesitate to email me at asebullion@gmail.com