If you're really that fast, why not attempt to break a record in a more well known distance like the 10k or half? Ten miles is sort of an obscure event, and if I'm reading this correctly, is one of the few records that does not require doping control for ratification.
http://www.usatf.org/About/Anti-Doping/American-Record.aspx
BTW, Rossi had GPS data for his turkey trot 5k PR. Anyone could easily give their Garmin to someone else to wear or even bike the course themselves. Would be ultra cool if I'm wrong, but there are a lot more Rossi's than there are Greathouse's.
"I'll believes it when I sees it."