Bro,What if someone brings it with them in their suitcase?
Edit: Okay, read the last part of the sentence.
1. you cannot enter Canada on a PR card that you did not exit with. You need to get a PRTD.
2. Get SIN in the couple of days? Your optimism is admirable .
I needed to change my SIN from temp to permanent,. I called in March to book. The earliest appointment I could get is in June and they are not taking walk-ins. Only other option was to apply online which takes min 20 days. That is your best bet. If you already have your COPR, you can apply whilst outland, and give your friend's address.