If the Canada Revenue Agency (CRA) does not have a record, they may not have been Netfiled. You would have received an email when you Netfiled them to confirm they were received by the CRA.
If you used our TurboTax Online - you will need to sign back into your Online Account using the same credentials you used to complete your return. Please follow this next TurboTax FAQ link to answer a few questions: Why can't I find my return?