One big red flag not mentioned is Tom Petters' associate Frank Vennes. A lot of these high-rolling investors, not to mention several elected officials apparently knew Mr. Vennes served time for a conviction for money laundering and invested anyways.
I took a look at the judge's ruling and could find only one mention of Frank Vennes - a footnote in one of the 107 pages. This is it:
James Fry of Arrowhead was indicted on various criminal charges, on the assertion that he worked with Frank Vennes of Metro Gem to fraudulently lure investors into the Petters scheme.