Here's how you hunt the cellar hole: Pinpoint, dig, repeat. Dig everything. You NEVER know. If you dig lots of junk, then the place will be 'cleaner' the next time you go out. Take all the trash you dig, and dispose of it properly, and keep hitting the place. EVERYWHERE people have been, they've lost things. Everywhere. There is something at the cellarhole (most likely on the outside), so if you dig every signal, gradually remove all the trash that's masking the treasure, you'll eventually find it. I'd say that advice is likely true of any potential site, but if you've got a cellar hole from a home that's been gone 100 years, you're sitting on a goldmine.
Good luck, and post your finds here.
Roger