To be on the safe side, i have also submitted original dox since they will be returned after verification. Also if u read the Appendix A
Checklist of CHC Islamabad, it is written
Assemble all your documents as listed. Check (ž) each applicable item on the checklist and attach the
checklist to your documents (a paper clip will do). Place all the documents in a sealed envelope. Send
originals of all documents, including the Certificat de sélection du Québec (CSQ), if your intend to live in
the province of Quebec, and the police certificates.
Now its up to u watever u decide.