Oh, mistakes are made all the time. That I don't deny. The report plagiarized was authored 7 years ago.
Now, answer these questions if you don't mind. What are the likelihood that a report like that would just be laying around? Why did the author of the report need the report of 7 years ago to write the current report? If he didn't need it, why did he have it? If it was merely a mistake, why did the quote specifically relate to the government being good with money?
The fact is, the person who wrote this went back far enough and got a quote obscure enough that he thought he would never be caught. There is no other logical explanation.