no, they didn't ask any copy for labor or I-140, or company financial statements. Just ask where I am working, what is my job? And also ask my spouse the same question, even I am primary application and take his employment letter.
We took oath, then the office asked several YES, NO questions, like criminal.... Then review my spouse's case, ask how many children, if they are all on the list. And also ask his job. Then review my case. Ask how many children I have, my job, how long I have been worked for my employer, employment letter, tax return, marriage certifcate. The office reviewed every year tax return and asked for copies.
Then he took our fingerprint, and let us sign. Then stamped my passport.