Lots of these stories are turning up today.

Trove of 239 Rare Gold Coins Discovered in Walls of French Mansion
Renovators discovered a hidden box and pouch stuffed with rare gold coins, minted during the reigns of French Kings Louis XIII and Louis XIV

Beginning in 2016, all treasures discovered in France automatically became property of the state. However, since the mansion owners purchased the property in 2012, they have the rights to sell their finds, reports France 3. Per French law, the proceeds from the sale will be split in half, with half going to the married couple who owns the property and half to be split evenly among the three discoverers.