Thanks everyone for your comments. Sounds like follow-up is the key here.
@oscupa--We sell loans to Freddie Mac and and 10% sample is required to be reviewed each quarter. In conjunction with those reviews I perform on Freddie Mac loans, I also sample loans we retain in-house. We find it useful to spot trends as @BabyB mentioned, especially with RESPA. The reviews are quite comprehenzie. If I waited and did targeted audits of specific areas, the number of loans is small enough, I would likely be sampling the same loans for each test anyway.
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My questions and opinoins are my own and not my employer's.