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
To file a claim with UPS see this guide
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