Shlomo Hamelech states in Mishlei (10:8): “Someone who is smart will take mitzvos.” Midrash Rabbah (20:19) says this “smart” person is a reference to Moshe, who sought out Yosef’s bones during Makkas Choshech. While the rest of Bnei Yisrael were busy looking for the Egyptians’ gold and silver, Moshe was busy with meis mitzvah.