RELIC 1/3 - ANCIENT COINS - JAPANESE 2 SEN COIN
Coordinates: [712571; 3415931]
Note: In the tunnel adjacent to the bunker. The entrance is located near the Endurance Overlook base camp.
Look for a box at the end of the way. Take the Coin and turn it 180 degrees to examine it closely (reward: 25 XP + 10 XP for examining the coin).
RELIC 2/3 - ANCIENT COINS - 100 MON COIN
Coordinates: [712568; 3415929]
Note: In the room adjacent to the main bunker area, but you can only get to it on your way back from the Endurance, which is after receiving the rope ascender. When you're there, look around the upper floor for a closed door. Shoot a rope arrow and use the rope ascender to open it.
Scramble up the object on the right and leap over to the newly unlocked passageway. Approach the desk and take the Coin from inside the box (reward: 25 XP).
RELIC 3/3 - ANCIENT COINS - PORTUGUESE TIN COIN
Coordinates: [712559; 3415928]
Note: Near the bunker, but you can only get to it on your way back from the Endurance, which is after receiving the rope ascender. When Lara uses a rope arrow to unlock the way inside the bunker, she'll reach a previously inaccessible ledge.
The box with the Coin is to the right (reward: 500 XP).