If you filed under 3 year rule, I'm pretty sure you accumulated more bank statements, bills, other things since you filed N-400? If you haven't submitted tax return transcripts, make sure to bring those.
I filed under 5 year rule. Even though not strictly required, I'll bring all evidence of bonafide marriage I have including new stuff that I accumulated since I-751 got approved. I'm also planning bringing all ID cards etc issued by USCIS as well as all passports including expired ones I have.
I wouldn't walk into the interview empty handed. It sometimes creates a bad impression and causes more questions and grilling.
In other words, I'm bringing everything to help proving my entire immigration history if asked.
Good luck!