Overview
Altogether there are three hidden treasures in Resident Evil 7, each of which can be found following the tips of its respective photograph. ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
Photography – First Treasure – Steroid
This photograph can be found in the basement of the main house, where Jack is faced a second time. It is in the processing area, west of the incinerator room, on a shelf next to where the Scorpion Key was held.
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Once with the photograph, go back to the first floor and go to the main hall, entering the secret passage behind the eagle painting. When you reach the living room, go to the fireplace and examine a loose stone in the upper right corner. Behind it, you’ll find the treasure.
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The reward is a Steroid, which increases indefinitely Ethan’s health.
Photography – Second Treasure – Magnum Ammunition.
The photo is found near the old house. As you approach in the direction of the trailer, go to the entrance on the right, which leads to the stairs. Before starting to climb, stop and look to the left: you will see the photo stuck in the vineyards.
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To get the treasure, go back and go to the trailer. When you get there, turn left and go to the bathroom. The ammunition will be inside the toilet.
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The reward is three ammunitions for your Magnum, which can be obtained in the trailer for nice antique coins.
Photography – Third Treasure – Repair Kit.
At a certain point in the game, you will acquire the Snake Key. Go to the main house lounge and go up to the second floor. You will now be able to unlock the Master Bedroom. The photo will be in the deposit, on a stool next to the counter where some cleaning products are kept.
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With the photo, go to the third house, which is close to the trailer (you will need two cards to enter). In one of the rooms, you will see a cage with a mannequin head wearing a hat. Interact with the head to reveal the kit.
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The repair is a Repair Kit, which can be used to repair broken weapons.
Credits
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All praises and merits go directly to Resident Evil’s Biohazard wiki page. Any suggestions, acclaims, critiques or updates, feel free to manifest in the comments. My sincere and heartwarming gratitude. Have fun treasure hunting!