Problem like your bumper of your car is what happens when the impact damage spring backs leaving no evidence of damage but defects behind.
Im sure mr boeing has thought of that though.
As an example, I recall a Pan Am B747 engine that caused quite a stir when it got to the shop stinking to high heaven. When they took the nose spinner off they found a bird carcass neatly nested into the fan disk. Lots of questions at the time on how the bird got in and made a nest before dying when the plane flew off.
When they more closely examined the spinner they found that the fiberglass shell was cracked and full of blood spatters. It seems that the bird had caved in the spinner upong impact, cracked it and slipped inside as a blob before being centrifuged inside the face of the fan disk. The spinner than simply sprung back and closed up the crack.