There is a character in the Haven Crypts that allows you to trade Questor Tokens. But like every other Quest, those things accumulate in your Inventory so you can 'check your balance' with that.

The Giant and/or Wealth Chest should be able to be found in about 5 seconds by using the Maps 'Show Active Quests' feature. While on any of the 8 sub maps or the main map the name of that quest will be colored Red if it exists on a different map, and will become colored Green when on the correct map and the particular square will be shown to you.