Have you ever seen gold bullion actually being sold to a bullion dealer?
You must either think that conclusive testing gets done by the bullion dealer who buys gold, or that there aren't any dishonest people out there.
Buyer beware; no matter what you are buying.
You might be surprised, maybe shocked (given your disbelief of the story) and I doubt that you would ever be comfortable buying gold bullion again (if you ever have).