Whether a loan was approved or denied was never a factor in whether a SAR was required.
Although it's been promised, there is no interpretive information on all the new boxes. So, the critical instruction on the FinCEN SAR is "Check all that apply." My suggestion is that you write your narrative and, when you have it nailed, then go back and check the boxes that are consistent with your story.
Based on what you've said here, I would check:
31(d) Consumer loan
34(z) Fraudulent documentation
38(z) False statements on application
Opinions on the specifics may vary, but you're on the right track.
In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.