I have a question. What do you mean by "both copies of the COPR"? Isn't the only COPR the stamping that they put in your passport? Is there another document in addition to this?
When you get your stamped passport back from IRCC, it has following things in your package
1. One time entry visa sticker on your passport
2. Two copies of CoPR, one with photo you sent stick to it which is IRCC copy, the other without photo which is client/your copy
At time of landing, they will retain ircc copy, client copy is handed back to you.