This page of the guide to The Witcher 3 Wild Hunt includes walkthroughs of treasure hunt quests in White Orchard. These are minor optional missions related to, among others, viper school gear and two unique swords.
Scavenger Hunt: Viper School Gear
This task is about finding blueprints for a legendary equipment of the Viper School. In order to find them, you must perform two exploration trips. You can do them in any order you want.
First step is to find Kolgrim corpse. It can be found in crypt near White Orchard Cemetery (M1,5). Access to the crypt is protected by a wraith on seven experience level. You can either try to outrun the monster or fight with him. In second situation, use many dodges and help yourself with magic traps placed with Yrden sign. Walk to the crypt and destroy the wooden door with Aard sign. In the crypt you will face another wraith - you can either defeat him or lure outside. Find Kolgrim corpse in the crypt and examine it - you will receive Serpentine Steel Sword blueprint and Letter from witcher Kolgrim of the Viper School.
Second step is examining bandits camp and finding interrogation report. The camp is located on a hill near Ransacked Village (M1,6). You can reach it by climbing on the rocks from the west side. Defeat the deserters and their leader after reaching it. Then, examine the camp. In one chest you will find the interrogation report. Take it and read it from the inventory. You will also find Serpentine Steel Sword blueprint in the chest.
In this task you must find the hiding place of the deserters. You will learn about this quest by reaching a small camp in the northern part of the map (M1,8). In the camp you must examine a corpse and the chest, and take Spy's Notes. Read it in the inventory.
Set this quest as active and go to the Mill on the West. Take an interest in a hut near the mill (M1,9). Walk inside. You must unlock the passage down, it is easier to do it with Aard sign. In the basement you will find few containers. To complete the quest, you must loot the ones with Vrihedd Brigade Sword and Hunting Trousers.
This task is to finding the deserters treasure. You will learn about the possibility to unlock it by reaching a small camp in the northern part of the map (M1,10). After reaching the camp, defeat some wolves and wargs. Search for the chest in which you will find scrawled notes. Read them in the inventory.
Set this quest as active and go to the bandits' camp on the East (M1,11). Attack the deserters and watch out for their leader that is using a shield. It is best to stun him with Aard sign and then flank him before he regains his strength. After a victorious battle, examine the camp. In one of the tents you will find a chest with Maribor Sword.
In this task you must find the lost Temerian treasure. You will learn about this quest by reaching a small bridge west from the Mill (M1,12). Start by eliminating nearby drowners. After that, search for a corpse near which you will find Temerian lily key. Now you can dive and search for the closed chest under water. Open it with the key and take Blood-soaked military orders book from there. Read it in the inventory.
Set this quest as active and go to the Mill on the east. Take an interest in a hut near the mill (M1,9). Walk inside. You must unlock the passage down, it is easier to do it with Aard sign. In the basement you will find few containers. To complete the quest you must loot the chest (use the key again) with scribbled document (you can read it, but it is not required).