Whatever civil documents you uploaded to the system during the NVC submission, take those. And make sure it's the exact documents. For example. When we were uploading the information for my wife, we could only find her short form birth certificate, so that's the one we uploaded. In the meantime we located her long form certificate, so when it came time for the interview we took it instead, thinking since it has more detail that it would be better. No. They needed to see the one we uploaded, so she had to submit it after the fact.
So yeah any civil documents you uploaded is what they're looking to see.
Good luck!