To add a new lootbox open the DT_ChestWeapons. Here you need to add or duplicate a row. You can make 2 types of chests: with weapons or with skins. To make a weapon skins chest you need to set the ChestType variable to WeaponSkins (1) type. In this situation you need to fill the weapons variable with the DT_CustomWeapon data table rows (2) as skins use different data table. If you want to hide the item in the chest overview then set “Hidden” to true (3).
If you want to create a new chest with skins you need to set the chest type to “Character Skins” (1) and use DT_CustomSkin data table rows (2).