Hahah LOL, you are welcome. Yes you need to write a letter and send it with the seizure form.
Keep in mind at sponsorship is completely different than refugee program. So it’s handled differently. That means when you go to your landing interview, the officer is going to expect you have a valid passport, show them the exemption letter that they are going to issue it to you, then he/she will request for your passport to be returned to you. That’s what happened in my case at least lol