Thank you! In our case, my spouse was kept in AP and kept his passport. They returned all of his original documents. If you are approved on that day, they will only keep passport and return all other documents. However, if you put in AP depending on the case they might keep original document as well. I think there was someone in this forum whose was put in AP and they kept their documents and passport.
People also suggest carrying certified copies of original docs but I dont have idea as I have not done that.