Reporting RRSP Contributions
You will need to report the RRSP contribution on your tax return, but you don't need to attach the receipt.
You'll claim the deduction on Line 20800 of your T1 General form, and you may also need to complete Schedule 7. The RRSP issuer will also provide a T4RSP slip if you withdrew funds from your RRSP, which you'll need to report on your tax return.
So, to clarify, you do need to report the RRSP contribution on your tax return, but you don't need to attach the receipt itself.
Hope this clears things up!