FamilySearch.org has an online database of estate records from across the state that span 1663-1979. Thanks to a collaboration between the NC Genealogical Society (NCGS), the NC State Archives, and volunteer indexers, the database is being made available online at https://familysearch.org/search/collection/1911121.
At the time of this writing, not all the counties were complete, so please consider helping out! Contact the NCGS for more information. Meanwhile, if you’d like to see a list of Duplin County records so you can browse, rather than have to search, view the document below.
If you’re unable to view the document, you can see it online here.