why I now prefer Fed Ex

thought we were sailin along - I overnighted our home study "packet" (HS, IL endorsement, etc) to our agency on Tuesday evening at 4:49 (according to my receipt).  It was GUARANTEED to be delivered to our agency (they send our 800A app in for us) by NOON on 12/14.  So where you ask was my packet at noon on 12/14 - was it at your agency in Birmingham, AL...nope, it was in Chicago, IL.  When I called USPS (that's United States Piece of .....kidding, kidding) customer service the nice lady said "um, your package didn't arrive (really?!?), it's in Chicago (yes, I said that when I called you).  um, I'm not sure why it's in Chicago because it's supposed to be delivered to Birmingham, AL (yes, again, that is what I said when I called you).  I will have to have somebody call you back - promise, it will be before end of the business day today."  USPS closes for the day & still no call - according to website, package still in Chicago.  I call first thing this morning and speak with another lady (not so nice) that tells me "your package is in Chicago"  I ask for a supervisor who (shocker) is busy - she will have to call me back.  Supervisor calls "Ma'am, your package is at our distribution center in Chicago but somebody is looking into it."  Great. I continue checking USPS website & see that at 9:19am my package arrived in Birmingham (website wasn't updated until noon though) and that my package was "guaranteed delivery by noon on 12/14" (yeah yesterday).  At 12:30 the "inquiry dept" calls me "Ma'am I have great news, your package has arrived in Birmingham and is on route to your destination.  Also, more great news....if you take your original receipt to your local post office & fill out form _________ we will issue a refund for the overnight shipping costs since we were unable to deliver your package by the guaranteed date."  I replied (and I swear - I'm not always a nasty person but come on) "great!  I wanted to let you know that the contents of my package included my adoption home study.  I will be sure and let my daughter, who by the way is sitting in a Chinese orphange know that we are so sorry we were delayed in bringing her home but that she will probably be relieved to know that we got our $19 refund from the postal service."