We brought in copies of our beneficiary information, and emails on February 16th, in person. We also brought in our son's birth certificate back in January. My boyfriend also wrote an email giving some more information on our relationship and our intentions to get married. He was out of status, but the immigration officer seemed to be more concerned about the genuiness of our relationship. I saw from previous posts that you are from Mexico, so is my boyfriend.
In the original application, he also sent in copies of his Alberta's driver's license, medicals, Mexico security check, and a bunch of other stuff.
I really hope this helps you out with your situation,
Suzanne