Mail Delhi University sealed envelopes to Canada by Parents in India

Is it ok if I get the Delhi University transcripts back at my home address in India and then my parents can courier it to Canada as it is sealed.

They can send sealed packet to Canada in a one different envelop?

This will help me save the high fees that DU charges for applications from outside India.

Yes, you can do that.
Just ask your parents to not open the sealed envelopes.

Pack all sealed envelopes in a new envelopes and send them to you to Canada. That would work. No issues.