U.S.P.S. sometimes I wonder

This past week I bought a flex plate over on FBBO, I'm in Tx he was in Missouri. Put the money order a flat rate priority envelope which is 3-4 day delivery. Saturday ( the 4th day) I look at the tracking expecting it to be out for delivery....the damn thing was in Santa Clara Ca!
I called USPS to find out what the hell happened, they could not offer any explanation other than the sorti g center might have had some issues like weather and if it needed guaranteed I should have sent it Priority. Hell I though I did @ $9...??? I could have sent it regular mail and had it there in 4 days....
No wonder they lose money when they send a package 4000 miles out of Its way...