No, you do not need to mail in any receipts but mu...
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After you file

No, you do not need to mail in any receipts but must keep them available if CRA requests that you submit them. If you do receive a request for supporting documents, you will receive a Case or Reference and instructions on which tax centre to submit them to. 

https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/review...

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