junior967, You said the article told you that in his last days he was VERY Paranoid and moved out of the main house into a small cabin. The cabin was surrounded by a 10' Log Stockade Wall.
If I was pursuing this cache, I would NOT Look for GOLD or Silver of ANY sort. This is due to Sam "Lobo" Wolfe's directions in the 70's.
I would be looking for The Cabin Surrounded by a 10' Stockade Wall.
My reasoning is that him being that Paranoid Psychotic he wouldn't be able to let his treasure out of his sight. He would have to have the Wall so that anyone coming close to the cabin would have to let Him let them in. The Cache/Treasure is inside the stockade and probably Below the Chimney foundation or the Hearth.
Gold and Silver won't be a viable search target due to the Lost Jewelry and Lost Silverware from that time period, OR any lost items up to present day.
Carl Von Muller covered this in his Treasure Hunting Manuals 6, and 7. The reason no one has found this cache is, OH Wait How do you KNOW this treasure hasn't been found and what everyone is picking up is the residual target from where it was till it was found!!