Kotholl, a hired hand from the merchants' camp, was ordered to guard three specific chests with his life. He states it would be bad for the contents to fall into the hands of the Maulborn.
Find Appraising-Spine's Key, Valyia's Key and Frahjan's Key
I need to search the bodies of the dead merchants to find three keys. Once I find the keys, I can open the three locked chests.
— game journal
One finds a collection of valuable Strange Relics from various races inside the chest. Although valuable, the items definitely seem not as necessary for the Pact as proclaimed. It turns out, Kotholl has lied to the player, because the merchants owed him his payment, but unfortunately died before he could get the money. So he thought up his little plan to get into the possession of the items, so the profit from selling them could feed his family. The player can decide to let Kotholl keep the items or convince him to give them back to the merchants' families.