[mothered]

It depends.  From what I understand, if the carrier notices any damage to the package they will likely raise a damage report which in some cases can release them from liability.  This can work for you, especially in regards to the fellow se'r you replied to because once he shows the photos of the damaged package to the carrier and they see that there was no damage report made, then the carrier company would be liable due to the negligence of handling and delivering a damaged package without making any notations.  Please feel free to correct me if I have that all wrong.

If the carrier didn't generate a damage report, then the package wasn't damaged In transit and at the time of delivery.

As such, If you damage It yourself, you'll be held responsible.
It's not possible to argue this:

the carrier company would be liable due to the negligence of handling and delivering a damaged package without making any notations

How do you provide evidence of the driver's neglect to raise a report? I'll answer It for you - you can't.