We are back! Interview lasted one hour and the officer only asked me questions, and only 2 questions to my teen daughter about when my boyfriend came to visit.
We spent ages photocopying documents but she did not ask for any of them, including medical or photos, which I offered to show.
Half of the questions were from the 485 form, such as 'do you have plans to facilitate terrorism or prostitution?' Like, yeah and I would tell an officer if I did?
Anyway we left with the same piece of paper as shown in this thread by Edward and Jaycel. Now of course as soon as I arrived home I logged in to USCIS but to my surprise I no longer see the usual page with all the steps. It is now a new page that asks me what I want to do, but nothing about me, my case etc.
The officer said that unless we hear from her to show more documents we are good.
Just to update some of the Google reviews about rude staff at security: the staff were all very efficient and polite. We were asked to show the USCIS letters, ID, and take off our shoes and bags. That's all. Upstairs to my happy surprise there was not the usual arctic cold caused by AC madness so I did not freeze as expected.
The officer was a black lady, very elegant, very pleasant and with a rolling accent which at times I found slightly difficult. All the other officers I saw calling their customers seemed to be extremely pleasant and polite. Also, USCIS is now hiring Immigration agents...LOL
I will keep you updated, and I hope it's all good! (Should be: we have been together 6 years now!)
Thanks for all the comments! Very helpful.