I myself sent to USPS, but didnot having any tracking. I was able to find out only after my CC was charged. I got lucky..
But this happened to me only for overseas mail... I have sent a mail to overseas and I had tracking, the status was 'Available for pickup' and they did not take any action to deliver it. When I called USPS, after an hour's wait I was told to make arrangement for picking up the mail by the recipient... I have to send it again through fedex....It sucks...
I would suggest you to make one more print and application and send through FEDEX or UPS.