An incident happened in 1968 where this family register was to be used to find out whether or not a person was from Burakumin, which caused reading it prohibited and in the same year even the public viewing itself came to be prohibited, resulting in the sealed storage.
昭和43年（1968年）被差別部落民かどうかを探り出すためにこの戸籍が用いられようとした事件が発覚し、閲覧が禁止され、同年、公開さえも禁じられ封印保管された。