Scribe, I've detected many old house and ghost town sites and the majority of them have been detected before. Of course I found very little around the obvious places...AROUND the building and outbuildings. Then I began to hit the periphery .....the outer extremes of the building(s).....20, 30, 40 yards from the buildings and my finds increased dramatically. Consider that idea. Also, when I hit ghost towns in New Mexico (my annual jaunt), I make up a few "Treasures". I get some snuff cans (Copenhagen, Skol, etc) and put in a large, non valuable foreign coin with a note and my email address. On the note --- "Find anything?", or "You won't believe what I found here!", etc. I use tape to tape the seam of the snuff can.
I've hid around 10 of these 'Treasures', a few in Ohio and the rest in New Mexico. I bury these 'Treasures' just 2" or 3" deep in obvious places around the main building(s). So far in 3 yrs I've had no inquiries. Maybe some day...... Goose/Cy-Minn