Email from FedEx
FedEx cleared the air this morning:
Please be advised of the rate changes to your shipment dated 2011-07-20. FedEx has reviewed this shipment for correct pieces, weight, and service. Any changes made are reflected in the invoice amount.
The final rated amount of your shipment is $13.51 compared to the original rate quote of $13.51. Please consult the applicable FedEx Service Guide for details.