EXCLUSIVE: Couple who found $10m hoard of gold coins while walking dog could have broken law by not telling the police.

The mystery pair discovered the haul at their property in the Gold Country while out walking their dog. They stumbled across 1,427 rare, mint-condition gold coins, nearly all dating from 1847 to 1894, buried in the shadow of an old tree on their ranch in February 2013.

They have so far managed to remain anonymous despite worldwide media attention and fascinated locals desperately searching to uncover their identity.

The face value, of what’s being called the ‘Saddle Ridge Hoard’, added up to about $27,000, but some of the coins are so rare that experts say they could fetch nearly $1million apiece, and are being sold by Amazon in a special deal in May.