Other proofs: pictures of inside of home showing both your belongings, mail addressed to both of you at same address, sworn affidavits of neighbors or friends who know you live together, and other bills you both have in both names that come to that address.
A child born during the marriage is very strong proof. Try for letters from witnesses as well.
The above is intended only as general information, and does not constitute legal advice. You must speak with an attorney to discuss your individual case.
I agree with my colleague. You must prove that your marriage is bona fide, not a sham entered into to obtain a green card. While you cite a number of items you do not have, there may be many you do have. Gather and copy as many of the following items as possible in preparation for your application and interview: . wedding invitations, church certificates, joint bank accounts, joint credit card statements, joint club memberships, joint federal and state tax returns, time/date stamped photographs of you and your spouse taken before and during your marriage, wedding photographs, letters and/or emails sent, rental agreements, leases, receipts for gifts, etc. You can't go in there with merely an excuse. Perhaps you should meet with an experienced immigration attorney before your meeting. Maybe you would feel more at ease if your attorney went to the interview with you. Good luck to you.
Law Offices of J Thomas Smith J.D., Ph.D 11500 Northwest Freeway, Suite 280 Houston, TX 77092 713-LAWYER-2 www.MyImmigrationLawyer.info NOTE: Responses are for the education of the community at large and is not intended to be "legal advice." No attorney-client relationship is established by responses or comments.