neo: I know you posted a year ago - but perhaps you are still looking.
Most successful treasure hunters specialize. Are you interested in "general" caches (for lack of a better term)? Do you have a copy of the old WPA Guide to North Carolina? Most of these have been reprinted and they are excellent sources of treasure leads.
Are you interested in bootlegger and Prohibition-era plants? That would involve newspaper research - looking for stories of stills destroyed and rum runners arrested. Then you'd research the area, find the property owners, and take it from there. Same for stories of burglary rings busted.
Have you read Deek Gladson Sudden Wealth? It's probably the best introduction to treasure hunting ever written. Karl von Mueller's Treasure Hunter's Manual #6 and # are classics. His Waybills to El Dorado is an excellent guide full of examples. Many of these specific treasures have been recovered (as have most if not all of those detailed in THM #6). The key is to use these stories as blueprints.
Good luck to all,
The Old Bookaroo