This is obviously the now famous Fox that King Brown lost in the icy North Atlantic while duck hunting in a blizzard when his duck boat was swamped by waves. And then at the advanced age of his mid-70's, he recovered it by scuba diving for it at great depths in dark icy waters several months later. It is rumored that King's imaginary friends, John F. Kennedy and Martin Luther King miraculously drove the boat to the exact spot where King lost it in a raging winter gale months earlier. Mere mortals would need exact GPS coordinates at the very least to accomplish this feat.
He thought he had it restored, but the crafty gunsmith, aware of it's special provenance and value, kept it for himself and gave King another gun with altered serial numbers.
Either that, or several guys are screwing with the seller for putting such a high minimum bid on a rusty low grade Fox.