Yes!! courier is a good option as we can at least track the delivery. I made a mistake by sending my application to IRCC via mail , because i don't even know whether it's received or not..I sent the document on September 16th and they received on September 24th. I have a courier delivery confirmation. However, I didn't get any email from IRCC or wasn't updated on GC Key.
I heard that if there is any mistake in the application, they will send back your application but I didn't receive application back either.
Just waiting and waiting.
When i called ircc, they said if you applied on paper, they will not return your application if anything is missing.They will ask for the documents whatever is required by them.. Don't know what is going on, however some of people said that they will return and ircc people are saying something else..
We can't do anything without wait........
.