Dr Alex Cowie of Diggers & Drillers showed this photo at the Gold Symposium this week, along with a request for any further info should anyone in the crowd know more! Lots of interest in this nugget even in the mining community.
If it's legit the owner of the nugget could be secretly buying nearby leases or tenaments. Its happen before but sometimes if their is more than one person on board it normally ends in tears. Or maybe the owner burried it in the backyard.