I'm not entirely convinced with how that quest was designed.
Step 1
Talk with the merchant, ok. It's a normal dialogue, but I didn't see an option to discuss about the payment.
Now, the quest Journal
There isn't any mention to the road and where the player have to go to find the box. So...without any quest markers, how the player is supposed to beat this quest?
Step 2
The player follow the witcher senses and find the box. He can examine the scene to find out any clues.
But this is extremely hand-holding. The player doesn't have any possibility to fail in the investigation (like in The Witcher 1, Vizima Confidential). It's just...press the button.
Step 3
Return to the merchant, and here the player have two options in dialogues tree. Expose the liar or look the other way. But why a player should select the second option?
Step 4
Once the player have exposed the liar, it start a chase. Here the player hit the merchant...so it is supposed that the player have killed the NPC (and the lack of a timing in the slow motion makes that hit extremely easy). But the merchant is alive and completeley healthy.
I hope you are aware that you are comparing a small sidequest which can be completed in less than 10 minutes with a main quest from W1?
And on the other hand, how many quests are there in W1 or 2, where the player can actually be misled and come to the false conclusion? Most of the time you can make decisions based on your knowledge, which are not clear cut right or wrong.