'Considering those numbers, how is it possible that the Share Volume Report shows more than 17m shares traded hands in the month of September? It seems highly unlikely that more than 100% of the company's free trading stock changed hands during the month.'

Likely scenario could be that two or more brokers act in tandem to shuffle shares between them, thus on paper being legal trades i.e. settling within 3 days, but not actually covering for weeks or more on end. This artificial trading could account for the false volumes traded.