C. F. Keil and Franz Delitzsch on 2 Chronicles 31:11-12

2Ch 31:11-12

Then the king commanded to prepare cells in the house of God for the storing of the provisions. Whether new cells were built, or cells already existing were prepared for this purpose, cannot be decided, since הכין may signify either. Into these cells they brought the תּרוּמה, which here denotes the first-fruits (cf. 2Ch 31:5), the tithes, and the dedicated things, בּאמוּנה, with fidelity, cf. 2Ch 19:9. עליהם, over them (the first-fruits, etc.) the Levite Cononiah was set as ruler (inspector), and his brother Shimei as second ruler (משׁנה).