Thanks everyone, printed off some more paperwork but didn't need it. Told the officer I was here to get married and got asked to go to a side room and had further questions (who am I marrying, what am I doing after, why aren't I marrying in the UK).
Couple of minutes of questions, another few minutes of watching the guy type but no paperwork requested. Kinda bummed out neither of them said congratulations, but nevermind!