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.
Near the Charts, you will find a blue marking pointing towards it. 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 Verdera town in the Lozania region in Madrugada.
Verdera Criptograma Chest and Criptograma Charts #16 & #19
The Criptograma Chest is on the top of the billboard in Verdera town in the Lozania region in Madrugada as shown in the picture below.
Criptograma Chart #16: From the chest, follow the blue markings and go south. The chart is on the wall of the water tank on the house south of the billboard.
Criptograma Chart #19: From the previous chart, follow the blue markings and go further south. The chart is on the wall of the water tank as shown below.