I really wonder which cog exposed the whole scheme, a whistleblower from 1) company stumbled on it, or a 2) vendor staff did, or, 3) a vendor started asking que

I really wonder which cog exposed the whole scheme, a whistleblower from 1) company stumbled on it, or a 2) vendor staff did, or, 3) a vendor started asking questions of the random invoices, 4) a dispute in the corrupted amounts between both (seems likely!) or 5) misreported earnings or high income tripped some flag at the irs level. so many possibilities!