If you have your birth certificate, you do not need to send 10th certificate or any other document as a proof of date of birth.
However, if your birth certificate is not in English or French, you need to send the following:
1. Notarized copy of original birth certificate
2. Notarized original translation of birth certificate &
3. Sworn affidavit from translator.
If you have missed on any of the above, you can send your birth certificate in English that you have now and mention all the personal details & package delivery details which could help CIC to locate your original application.
Also, send a mail to cic explaining the situation along with your personal details & package delivery details (of both the packages) and request them to add it to your original package.