Missing Treasure - Spawning Ground

Yet another quest I accepted and there are three tasks to complete. The first one was to defeat a Cantankerous Zerlobb but when I defeated them, in my case all of them, I did not get the Key to the Hiding Place. For the second one, I did defeat a Jabbox and received the Map to the Hiding Place. But for the third one, I cannot complete the task to retrieve the treasure chest from the hiding place without the key. Is there a glitch with this quest? Or is there something else that I need to do to complete the first and third tasks?

 

what is the name of the quest, did you check wiki?

 

Go back to the map and keep killing Cantankerous Zorlobs until one drops the required item. Reset the map, and repeat, until one drops the item. You are not guaranteed an item drop from a certain number of kills. Sometimes, due to random chance, it may take a lot more kills than you would think. Each kill has a percent chance to drop the item. If you are unlucky, it may take many kills to get the item.