"while I have given to the palace on your behalf 1,080 pounds of copper, and umi-abum has likewise given 1,080 pounds of copper, apart from what we both have ha

"while I have given to the palace on your behalf 1,080 pounds of copper, and umi-abum has likewise given 1,080 pounds of copper, apart from what we both have had written on a sealed tablet to be kept in the temple of Samas." I would be interested on what this joint-written, sealed tablet kept at the temple is. Some kind of escrow system? Unfortunately the wikipedia article does not mention anything about this cryptic phrase.