This item is not included in any spawn asset, but it doesn't necessarily mean that it doesn't spawn naturally on any of the maps.
IR_Jambo_Ammo.dat
GUID 2681c55d54de446e9303f1fad66ecfa0
Type Magazine
Rarity Mythical
ID 15055
Size_X 2
Size_Y 2
Size_Z 0.2
Amount 4
Count_Min 4
Count_Max 4
Calibers 1
Caliber_0 289
Blueprints 2
Blueprint_0_Type Ammo
Blueprint_0_Supplies 1
Blueprint_0_Supply_0_ID 15055
Blueprint_0_Build 30
Blueprint_1_Type Ammo
Blueprint_1_Supplies 1
Blueprint_1_Supply_0_ID 15055
Blueprint_1_Build 30