You would have to get tax forums from the IRS. Word of mouth isn't good enough any more. No way of verifying = no job.
As long as he can get the three past years together he should be employable. My current insurance keeps asking me to verrify 2 years experience... I had the same problem when I was un-employed 8 out of 10 employers did not exist any longer.
3 years non driving experience, 10 years driving experience. This is non-negotiable. No verification = no job. He's been driving for 30 years, so he would need to verify 10 of it. Like I said, the IRS is the best way to do this.