In the first excerpt, the challenges that the discoverer faced was that the discovery was gone by the time that the police and detectives were called.
In the second excerpt the challenges that the discoverers faced was how they were going to have to move the mummy from the place that they had discovered it.
In this story, the discoverer was Yuri, he had discovered a Mammoth Mummy. While he went to get the authorities, he discovered that the mummy had been taken away by someone.
The mummy here was a young girl from South America. The finders faced a challenge of how to transport the body.
They knew what may happen if they left the body where they had found it.
2. The challenges they faced and what they knew could happen to the mummies was what made them know that they had to try as much as they could to preserve them.
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