I was reading the FAQ section on the USPS website. I sent in my SC application with a Priority mail envelope with the delivery confirmation tag. According to USPS website such envelopes are not track-able. I have sent a query to CGISF. Hopefully they respond.
Hi EastEndi - when did you send your application? Has it been a while? Do let us know if they respond to your question. I will let everyone know as well if there is any update on my case. Hopefully we get it back and from now on we will be sure to use ExpressMail always. Its not worth having to worry about the fate of our applications. Better safe than sorry is my motto henceforth!