This guide applies to Sellers based in the United States only.
To file a claim with your carriers you will need to contact the carrier directly. Here is a list of their help guides to help with this.
UPS
For US domestic shipments the path to file a claim with UPS is via 1 of 2 methods:
Call UPS directly at 1-800-711-5914 [UPS associates are trained to support claims from 3rd party sellers.]
Follow this guide to file online at UPS.com (https://www.ups.com/ )
Note: A UPS login is required (anyone can create one), but a UPS ship account for payment/billing is not required.
FedEx
To file a claim with FedEx, see this guide
USPS
To file a claim with USPS, see this guide
DHL Express
To file a claim with DHL Express, see this guide
Insurance via UPIC
Make a claim for a USPS order using carrier insurance via UPIC, here