Ah. Yes, you do need original/certified copy docs for some things, although it’s DCF it’ll be the same document requirements as usual - https://travel.state.gov/content/travel/en/us-visas/immigrate/the-immigrant-visa-process/step-5-collect-financial-evidence-and-other-supporting-documents/step-7-collect-civil-documents.html
And in the meantime, if you haven’t already do start gathering the rest of the docs i.e. police certs etc.
Best of luck.