Coffer: A Chest
Source: Nav
1 Samuel 6:8, 11, 15
Take the ark of the LORD, set it on the cart, and in a chest beside it put the gold objects you are sending Him as a guilt offering. Then send the ark on its way, / Then they put the ark of the LORD on the cart, along with the chest containing the gold rats and the images of the tumors. / And the Levites took down the ark of the LORD and the chest containing the gold objects, and they placed them on the large rock. That day the men of Beth-shemesh offered burnt offerings and made sacrifices to the LORD.
Ezekiel 27:24
In your marketplace they traded with you fine garments of blue, embroidered work, and multicolored rugs with cords tightly twisted and knotted.