An anonymous letter warned of danger but was unsigned. How was the sender identified?
Category: Mystery · Difficulty: hard
Hint: Consider physical aspects of the letter beyond handwriting.
Answer
The paper had unique fiber patterns
Explanation
Experts matched the paper's distinctive fibers to a specific batch linked to the sender.
This is a hard mystery riddle — a tricky one that takes a little thought. The answer is The paper had unique fiber patterns.
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