Does anyone know how the Express mail guarantee from USPS works? I haven't had birds make it in a day in so long I can't even remember. I am tracking a package right now that says guaranteed delivery by noon today (it is almost 3:00 now) and it hasn't even left the departure state yet according to the USPS system! What is their guarantee exactly? Is it money back? I remember someone saying something about the guarantee no longer being valid on live birds (unless I am not remembering correctly). Anyone know?