Lockpick

11 per playthrough: 1 free from the Duke at the first meeting (Vineyard) and 10 placed:

• Castle: Eastern Corridor 1F (cabinet by the door), Armory 2F (NW table) and Attic (boxes in the NE corner).
• Village: the Luthier's Yard outhouse (Outhouse #7), the West Old Town Farmer's Land well (Well Wheel) and the NE window sill of the Water Mill.
• House Beneviento entry: SW window sill of the Dilapidated House.
• River: puddle by the ladder in the Trap Chamber.
• Factory: locker in the Construction Tunnels (MB3) and NE workbench in the Operating Room (MB4).

The Survival Resources Pack adds 1 more.

Opens one lock and is used up. There are 8:

• Castle, Living Room: drawer → Shotgun Ammo ×4.
• Castle, Eastern Corridor: drawer → Wooden Angel Statue.
• Castle, Opera Hall 2F (NE corner of the balcony): drawer → Sniper Rifle Ammo ×6.
• Chapel, back bedroom: desk → Shotgun Ammo ×7.
• West Old Town, Farmer's House: drawer → Sniper Rifle Ammo ×7.
• Leonardo's House, NE room: drawer → Shotgun Ammo ×7.
• Factory, Generator Room Walkway: fridge → Yellow Quartz.
• Factory, Private Passageway: desk → Magnum Ammo ×3.

Takes a case slot (5 per slot). With 11 or 12 lockpicks for 8 locks you have spares: sell the leftovers to the Duke for 1,000 Lei after the Factory. Challenges: "Petty Thief" (open 1) and "Cat Burglar" (15 in total, across playthroughs).