Where are you???

On Monday (13th) I mailed my medical packet. I sent it Priority Mail (2-3 day service) and bought delivery confirmation for it. It is now Sunday the 19th, and usps.com still says that the packet hasn’t arrived. Agh!! So much for 2-3 days. I guess tomorrow I’ll have to call the Post Office and make them find my packet…please please please don’t be lost!!