"The man would not say what company he was with or produce identification."
After this, do YOU still want to see his books? I would think this would speak for his legitimacy. The only reason I would listen to his canned presentation would be to stall him long enough for the FBI to get there.
You must realize that door to door book salespeople are trained to...
1. Work the law of averages. This means knocking on 80 - 130 doors a day, to talk to 50-75 people, this should result in 25-35 presentations and 3-15 sales.
2. Not spend time with non-buyers. This could include negative, skeptical individuals who want to see his ID.
As far as calling the police/FBI why? What crime has he committed? Just as you're not obligated to buy his books, he's not obligated to show any ID.