Yeah, I'd wager it was his laziness and proneness to shortcuts. One thing, though: Article states the radio show took place a few months after he won so probably 1984 or 1985. Federal Reserve website states that there were 7.5 billion one-dollar bills in circulation in 1999 (couldn't find numbers for years prior 1999). Increase of one-dollar bills in circulation seems to have fluctuated a lot over the course of years, might have been a significantly lower number in 1984/1985. I mean, it'd still be an impossibly long shot but I felt like pointing it out.