This locked chest is the second of Madrugada's four Criptograma Chests, hidden in the Lozanía area. Find its two Criptograma Charts and it opens to give you a piece of unique gear.
Go to Verdera in Lozanía and look behind the El Paraíso billboard. The wind chimes will tell you when you are close.
The chest stays locked until you have both of its charts. Look for Guerrilla Sigils, the guerrilla markings painted near the chest, and follow them to each Criptograma Chart. Once you have both charts, go back to the chest and open it.
Inside is the Rioter Helmet MK II. The two charts you used are also added to your Criptograma Charts collection, so every chest you open moves both lists forward.
Criptograma Box 1 - Aguas Lindas
This locked chest is the first of Madrugada's four Criptograma Chests, hidden in the Aguas Lindas area. Find its two Criptograma Charts and it opens to give you a piece of unique gear.
Criptograma Box 3 - Costa del Mar
This locked chest is the third of Madrugada's four Criptograma Chests, hidden in the Costa del Mar area. Find its two Criptograma Charts and it opens to give you a piece of unique gear.
Criptograma Box 4 - Costa del Mar
This locked chest is the fourth of Madrugada's four Criptograma Chests, hidden in the Costa del Mar area. Find its two Criptograma Charts and it opens to give you a piece of unique gear.
Image: UbisoftCriptograma Charts
Criptograma Charts are the coded symbol sheets that open Criptograma Chests. Every chest needs two of its own, so you hunt down 30 charts in all to empty the 15 chests on Yara.