There are a total of 15 Criptograma Chests and 30 Criptograma Charts in Far Cry 6. Criptograma Chests get marked on the map as you get near it. To open a Criptograma Chest you will need to find 2 Criptograma Charts nearby, which act as keys to open the chest. On opening the chest you will find a Piece of Armor.
You will find blue markings pointing towards the charts. There is also a wind chime near the chest and charts. You can follow the noise of the wind chime to locate them. This article shows the location of Criptograma Chest & Criptograma Charts in the town of Ruben in the Barrial region in Valle De Oro.
Ruben Criptograma Chest and Criptograma Charts #17 & #20
The Criptograma Chest is at the highlighted location in the town of Ruben in the Barrial region in Valle De Oro.
Criptograma Chart #17: On the west side of the chest, you will find a cave entrance. Enter the cave and go till the end until you reach the waters as shown below. Here you will find the chart.
Criptograma Chart #20: This chart is under the jetty at the northeast side of the chest as shown below.
