AMD Warranty doesn't cover bent or broken pins.
Your Sender (Retailer/Vendor?) took the correct course in opening a case. The sender is responsible for making sure the computer is well packaged from being damaged and the computer was in working condition before shipping it to you.
I would also open a FEDEX case to try and get a refund for the box being damaged and the computer being damaged via shipping.
Good thing you took photos of the delivered box before opening it as proof the box was received damaged. In the future, if a Shipping company delivers you a package with obvious damage to it. Don't sign for it and send it back and alert the sender why you refused the package.
In this case since the AMD 3600 was damaged by you, the customer, and the AMD 1700 was damaged, either via shipping or by the sender, AMD Warranty will not cover your processors.
You will have to take it up with your Sender to see if they will replace your 1700 processor and damaged Motherboard.