Why did those who carried the bones of the other tribes not become impure, while those who carried Joseph’s bones did?

This source-based Torah study examines the question: Why did those who carried the bones of the other tribes not become impure, while those who carried Joseph’s bones did? The canonical Hebrew discussion develops the issue through the weekly Torah portion and the sources cited there, preserving the distinctions, tensions, and practical implications of the original text. This localized discovery layer does not add any new halakhic, medical, legal, scientific, historical, theological, or empirical ruling or claim beyond the canonical Hebrew source.