It has to have happened AFTER they opened it with correct packaging.
Books stacked face to face. Taped together with painter's tape with buddy tabs. Between two pieces of cardboard, taped together with buddy tabs. In a comic mailer, bundle taped down with packing tape with buddy tabs. Sealed tight, with packing tape and buddy tabs. Wrapped in bubble wrap and placed inside another box with enough bubble wrap to severely restrict movement.
Yet somehow several books have the same corner crunch, or a freshly pressed 9.4+ book comes back as a 6.5 due to a FULL cover length DIAGONAL bend (luckily not color breaking).