If you filled it out online, there is no need to send in the forms because you have already identified yourself with your HIN/SRN and postcode etc..
Every time you buy a stock you will get the email/online report form as all companies are required by law to make available their annual reports etc.. To save paper, they ask if you would opt to view them online.
If they pay dividends, you will get that particular form as well and if the company has a DRP, then you will get that form also.