Talkin About The Post Office........

I can't remember why or what I had to send (I'm thinking a cashier's check for a purchase) years ago from NC to somewhere near San Francisco by FedEx. Was told if I dropped it off at the local FedEx by 2pm, it would be delivered there next day by 10am. SAY WHAT?
I tracked it and it was delivered on time. I was amazed by that.