http://fedex.com/us/services/options/mbg.html
A money-back guarantee applies to FedEx Ground shipments to business
addresses and FedEx Home Delivery shipments to residential addresses
within the U.S., and to FedEx International Ground shipments if you
choose the brokerage-inclusive option. If the package is not delivered on
the standard scheduled delivery day, you can request a credit of shipping
charges.