I spoke with the Grump at the York musclecar show a few years back regarding the current whereabouts of his '69 car. He said it was "out near Pittsburgh". . . He did not seem to be eager to elaborate or discuss further.
In all fairness to him, I was probably the billionth person to ask him about it. His '69 car is one of my all time favorites and I'm sure I'm not alone. It would be a great find, indeed.