COD shipments via FedEx will print multiple shipping labels:
FedEx Express® COD shipments will print two labels. The first label is the outbound shipping label -- attach it to the parcel as you normally would. The second label is the COD return label. It should be included, face down, in a plastic pouch on the parcel.
FedEx Ground® COD shipments will print three or more labels. The first label is the outbound shipping label -- attach it to the parcel as you normally would. The second label is the COD return label. It should be included, face down, in a plastic pouch on the parcel. The third label is a copy that the shipper may keep on hand as a receipt or may discard.