That is graet...that is EXACTLY what USPAP says State appraisal boards can require anything they want to be in a workfile. They may say a ham sandwich needs to be in there and a pack of gum. If they did.....who would you complain to? State appraisal boards are dictators. Whatever they dictate.....is up to them.
What USPAP means to you may have little similarity to what a particular state board thinks it means. What they think it means wins every time. They may be 100% right...or wrong...who you gonna complain to?
To me, a work file consists of all written data you used to prepare the report. ALL my reports and data go into their own 9 X 15 file jacket with one side open. When "they" require me to get a brain scan, that's when I will quit.