As long as your tracking for Canada Post says it’s been delivered, you’re fine. (My husband and I used Canada Post, and it arrived just fine, albeit late despite two day guaranteed delivery. I sent them a complaint and got back the $50 bucks it cost me so it was fine in the end and cost me nothing!)
You’ll likely be waiting a while before receiving an AOR1 as they’re now way behind. I think after all this business with COVID it’ll be a long time before we start seeing any application being processed in three to six months again no matter who the PA is or where they come from. Those days are over for now.