Context: The U.S. GAO's 2010 findings regarding the great difficulty of accurately gauging the economic impact of copyright infringement was reinforced within the same report by the body's research into three commonly cited estimates that had previously been provided to U.S. agencies. The GAO report explained that the sources – a Federal Bureau of Investigation (FBI) estimate, a Customs and Border Protection (CBP) press release and a Motor and Equipment Manufacturers Association estimate – "cannot be substantiated or traced back to an underlying data source or methodology."

Question: What 2010 body found how difficult it is to accurately report the financial impact of infringement?
Answer: U.S. GAO

Question: How many commanly cited estimates did the body report on?
Answer: three

Question: What did the FBI use as a source?
Answer: estimate

Question: What report said the data could not be substantiated or traced to a reliable data source?
Answer: GAO report

Question: What 2010 body found how easy it is to accurately report the financial impact of infringement?
Answer: Unanswerable

Question: What 2010 body found how difficult it is to inaccurately report the financial impact of infringement?
Answer: Unanswerable

Question: How many uncommonly cited estimates did the body report on?
Answer: Unanswerable

Question: What didn't the FBI use as a source?
Answer: Unanswerable

Question: What report said the data could be substantiated or traced to a reliable data source?
Answer: Unanswerable