USPS Horror: Phantom Delivery Confirmation

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I just had a strange one myself. 2 items I sent out 2 days ago and my neighbor knocks on my door with the 2 items in hand. She offered to re-mail them but I told her I needed to email the recipients of the delay. Out of curiosity, I checked the tracking info and it said that both items were dispatched to sort facility....but ended up in my neighbors' mailbox???
I've heard of "gremlins" before but always "in house"!!
Called the Post Office and my actual mailman called me back with apologies for possibly sticking them in my neighbors mailbox before gettin back to the post office.
Fine and dandy, everyone has had some mail stuck into your neighbors mailbox by mistake...that's being human. What I can't understand, and couldn't get an explanation for, was why did the tracking info say that the items were "dispatched to sort facility" about 3 hours after "acceptance" when they were actually delivered just down the street about 3 minutes after "acceptance".
Whoa...this is giving me a headache...if ya can't trust the US government...whoa...bigger headache!!