Have you ever thought of getting a metal detector to scan the property with? It will make it easier to find buried metal objects on the property.
And is the house haunted?
We have a metal detector that we purchased from a local store in Gettysburg, but I think it's only a beginner one. When we were first installing the HVAC, we had taken the shop-vac and sucked dirt into it and then scanned the dirt, found a 1775 British halfpenny -
http://1760loghouse.com/?p=51
There was also pottery and other stuff, but I think that was the neatest so far...unless the bones turn out to be human, and I guess then they would trump the coin. As far as ghosts, not really...YET....I did not sleep well last night however, hope nothing gets stirred up from bones being removed.