I have seen reports by people who suspected they had received a second, citing poor edge and finish. No indication that they spotted a suspicious mark. It is difficult to tell if they might be seconds or just lesser grade. Like most other makers, they do make different qualities, and particularly the knife block sets appear to have shipped with some Gourmet quality and some of noticeably lesser quality.
"Kitchen duty is awarded only to those of manifest excellence..." - The Master, Dogen