“Some of these priests had charge of the utensils of service. They were required to count them when they were brought in and taken out. Others of them were appointed over the furniture, and over all the holy utensils. Others were also over the choice flour, the wine, the oil, the incense, and the spices. Others, of the sons of the priests, prepared the mixing of the spices. Mattithiah, one of the Levites, the first-born of Shallum the Korahite, was in charge of making the flat cakes. Also some of their kindred of the Kohathites had charge of the rows of bread, to prepare it for each Sabbath.”
It is not clear where these instructions come from since they were not part of Leviticus. In fact, the temple was not even present yet. Nevertheless, someone was in charge of making sure what went out of the temple also came back. Some of these were in charge of the furniture. I am not sure why furniture would leave the temple. I understand someone in charge of the holy utensils, the various amounts of flour, wine, incense and spices. Obviously, someone had to mix the spices. Someone also had to make the bread. Apparently the Levite Mattithiah was in charge of making the flat cakes, which were mentioned in Leviticus, chapter 2. The Kohathites Levites were also in charge here.