To help me understand and offer insights, please provide me with more information, such as:
* What is the significance of "WEQTETJU"? Is it a code, a brand name, a location, or something else entirely?
* What is the nature of the mystery? Is it about the lighter's origin, its function, its disappearance, or something else?
* What are the clues or hints you have? Any additional information, like a description of the lighter, any unusual features, or any other related details.
With more context, I can help you unravel the mystery and potentially solve it!