I had sent in all my boarding passes along with a full timeline of our gathering and reciepts and pictures we had. I also sent in more of our long distance call logs. Along with that they requested the sponsor's (mine) proof of residency again in canada even though i have already done that. I had given them all my letter of employments and tax reviews, etc. There are absolutely no other notes in our file other than this.
It said "pls request furthur proof of relationship ie; joint bank accounts, FBI clearance, sponsors proof of residency." This seemed just like a general request to me and then once recived it was acknowledged and transferred to LA. Once the officer in LA recieved it, about a month and a half later they probabbly saw all these notes and just asked for interview. The only notations were regarding the proof of relationship, therefore the VO in LA probabbly decided to pursue with interview.