UPS/Fedex really are aggrevating. I believe I've figured them out though. At their sorting station, they make a decision on when to deliver based on whether it's to a home or business. If it's to a home, they deliver it sometime between 11:-14:, when people are at work. If it's to be delivered to a workplace, they prefer to deliver it between 17:30 and 20:00, when most businesses are closing or closed for the day. All this is designed to maximise the inconvenience to the recipient, as their package waits in town in a warehouse for a few days before either someone gets frustrated enough to drive out there and get it, or until someone ends up disrupting their daily schedule to wait for a package, either at work or at home, at a time when they wouldn't normally be at that location. Every little orange slip they leave is a taunt.

Now I fear being missing for a few days, and then being found dead in a black plastic bag outside of one of their stations, covered in orange slips of "Missed you!" paper.