Scotthoh Farm Nickel Ingot
Scotthoh Farm is surrounded by enemies so to get into the building you’ll probably need to fight a few people first. The chest with the Nickel Ingot is within the house, but the door is locked. The key can be found inside the well nearby the farmhouse. You can jump down through the well then grab the key from the rock at the bottom of the well.
Camp East of Elmenham Nickel Ingot
In a camp east of Elmenham, you’ll find an elite enemy called a Hell-Raiser. If you loot and kill him you’ll get a Nickel Ingot.
Brisleah Farm Nickel Ingot
You can find a Nickel Ingot within the basement of the smaller building in Brisleah Farm. You’ll need to find the key near the church to unlock the basement to reach the chest.
Dunwic Nickel Ingot
In Dunwic fortress, you’ll need to kill and loot the Woe-Bringer. Look out for the enemy with the golden dot above his body, which is indicative of him holding some wealth. You go to Dunwic Fortress during the Triumphant Return main story quest
King’s Bury Nickel Ingot
To grab this Nickel Ingot, you’ll need to collect the key from within the church, then you can loot the chest from the other building near the church. You’ll go to King’s Bury during the Raising Iron main story quest.
Burgh Castle Nickel Ingot
The Nickel Ingot is found within the jailhouse at Burgh Castle. You’ll need to destroy the box and move the barricades to get into the jailhouse.