Well, you and I know you live in a USPS black hole, Harry! Mail circles your mailbox in 20-mile radii and stops in to visit all the post offices in surrounding communities for days before it accidentally ends up at your post office.
Dollars to doughnuts, when the 'list of destinations that are exceptions to the 2-day standard,' your zip code will be right at the top of the list! Right up there with Bemidji, MN, Lower Pelican Rapids, MS, and Two Empty Cups, NM.
Just sayin.'