karankullar said:Congrats bud
Canada Post is better as far as I know. Buy two express post envelopes. A bigger one and a smaller one. Put your address on the smaller one and put in into the bigger one along with your passport. This way they stamp the passport and they use the pre-addressed express post envelope to send the passport back. This way you can track the passport on it's way to Ottawa and you would know when they dispatch it from there since the tracking on the smaller express post envelope would be activated. I hope I did not end up confusing you. I have done this before and I am fairly sure that is exactly what CIC's website suggests us to do. Hope it helps
Thanks karankullar, My Lawyer suggested to send a cover letter with all details like UCI #, Application number, from and to addresses in it. As you suggested Canada Post seems to be a better option, I will go with this option.