BD tracks the sales lead shipper for 13 weeks, checking the volume during this period from the same period the previous quarter, and you receive points based upon the service level of the pkgs shipped which are in excess of the volume shipped the previous quarter. For example, if XYZ Co. ships 100 more ground pkgs this quarter than the previous, you would receive $5 (100 pkgs * 5 cents/pkg) and this will be added to your Amex card. I just had $329 added to my card this morning, just in time for the weekend, and will be going to Lowes to spend it on Saturday.
Retention leads work the same way but receive more urgent attention as this shipper may have indicated that they are looking to divert their volume to another carrier.
You can check the status of your Amex card. You will need to enter the card number and the 4 digit security code on the front of the card just above the card number to the right side of the card.