I highly doubt that the real code is random in that way. I'm sure there's some random aspect, but not all. If you're committing tax fraud, it's very valuable to know how to avoid tripping up the "audit this account" triggers.
This is assuming "who to audit" is even a software process or completely a software process, but fine, don't open source that if necessary. I really just want the IRS software that I personally use to be open source.