I wonder why CIC requests not to fill out the from section on the return envelope?
do they fill it out themselves before they mail it? If not, what if you return envelope cannot be delivered to your address for whatever reason (e.g. you filled out your address incorrectly in excitement). If there is no 'from' address, what do Canadapost do with your passports then?
Seems like unnecessary headache for applicants as losing a passport in the mail (specially one with a limited validity visa) can be quite a hassle to deal with.