Im from eastern Virginia and have searched around alot of plantation homes here and in the carolinas, My advice to you beng in ohio would be to research whether or not it was part of the underground railroad,known for hiding fleeing slaves from capture in root cellars, or Beneath hollows in hog pins or smoke houses was very common in those times,Fleeing slaves would alot of times bury any type of valuables they may have been trying to take into canada in these hiding rooms along the underground railroad.especially if they were in danger of being discovered by bounty hunters,The possibilitie of the house owners cache would be somewhere they could access it without being visible to there plantation workers,so check the hearth,the fireplace, chimneys,behind foundation stones in the cellar because plantation houses usually have stone foundations.Pretty much everywhere. Those are just a few possibilities but definitely worth checking out. Good Luck and remember, Safety,Scoop.Sift and Shutup. HH.