You can file online at USPS.com.
https://www.usps.com/help/claims.htm
You may be able to win this one. Make sure that you save all of the original packaging and take photos of the box to see if the box was damaged.
USPS is very picky on these kind of claims. There have been many instances of people shipping broken laptops to a friend and then claiming insurance for damage.
Good luck. Rick