Final answer:
The independent investigator found Frederic Boucher's involvement in the theft of hard drives by tracing telephone calls he made to a warehouse where the stolen drives were located.
Step-by-step explanation:
In the case described in the textbook involving Swainler's Technology, the independent investigator identified Frederic Boucher's involvement in the theft of 1,400 hard drives by finding telephone calls made by Boucher to a warehouse. This was not just any warehouse, but specifically one where some of the stolen drives had been traced to. The significance of these calls linked Boucher to the crime and undermined the initial belief that the theft was an outside job, a requirement for the company to collect on its theft insurance policy. This discovery would likely have been part of a broader investigation incorporating various data points and evidence, and it highlighted the need for thorough oversight and verification before paying out insurance claims, especially in incidents involving potential internal actors.