CoPR is not required. Just think about it for a minute. You are a Canadian citizen. That is proven by the citizenship certificate. You are providing a Canadian passport as additional ID and status proof. So why do you need the CopR at all.My wife lost CoPR, which is one of the mandatory documents in OCI process. What should he the next step?
Furthermore, if you check the OCI checklist from BLS, nowhere it says CoPr is a required document. So either you are mistaken, or someone is giving you false info.