Exactly...there have been several times I ordered things online or through catalogues but didn't specify (or pay for) Saturday delivery. Each time the package has made it to my local hub by Saturday morning but as its not scheduled to be delivered until Monday, I too get the "Not Due for Delivery" message. FedEx (here) is very good about allowing me to personally pick my package up if I really need it on Saturday, especially if I mention that the package contains needed medication.