I had gaps on my timeline and I really didn't have anything else to show, due to the fact that I didn't work or had a debit card ect. Everything was under my husband's name. So my lawyer told me I needed letters from family members, neighbors,landlord, friends that knew I was here at the months that I was missing. My husband typed some up had people sign them and got a print out of their id, and turned them in. Yesterday they approved me without getting an rfe. I suggest if you really can't find anything then to send some. Also just make sure the people that you get letters from are u.s. citizens or residents. Hope this helps. .