Join Date: May 2002
Location: Pittsburgh
Programs: MR LT Titanium, AA LT PLT, UA SLV, Avis PreferredPlus, HH Gold, Hertz PC, National Executive, etc.
Posts: 31,684
Have you called U.S. Customs and Border Protection? I would suggest they would provide a more definitive answer than the "When I did it a few years ago" at best, or "I think ..." opinion of folks here. I suggest you at least try that in parallel.
One thing I would say is that the fact that his passport has no marks in it means little in these days of electronic commerce.