I know where there's a big burl not to far from where I live but it's about 750' down a fairly steep hillside, it was on a stump where the tree was felled above it.
We said we were going to cut it off the stump and yard it up before we moved roads, but then it never happened and only became further and further away. I'd bet it's still around as I don't know how in the hell you'd get it out of there.