Proof that farmers are throwing stone statuettes into the hedgerows and smelting the silver and gold they find?
Look in the hedgerows, that is where the professionals look.
But that’s just a well known fact in the world’s history departments, the farmers don’t keep records. Can’t imagine why not.
The government does not operate like that over there. They do not shut down a farm for this sort of thing. They will shut down construction sites and yes there have been funny stories where the archies scrape a site and deposit that in a land fill. The hobbyist finds out where that land fill is and make fantastic discoveries that humiliate the professionals.