A thousand coins make one string, and with a long, shimmering string of coins lined up horizontally, you get twenty strings, and lined up vertically, you get ten strings. A fully packed cash box holds two hundred strings.
When Li Fan had slain Chen Jingu, the reward offered by the sect was twenty thousand strings of coins. They used cash boxes of this size, filling one hundred of them, and stashed them inside the jade amulet. Thus, Li Fan knew precisely because, of course, he had counted his first pot of gold.
Though the cash box might not look very big, each string of high-quality Divine Force currency already weighed over twelve pounds, and those two hundred strings amounted to more than two thousand pounds! An ordinary person wouldn't even be able to lift it, and even a Qi Condensation stage cultivator would find it barely manageable. Therefore, it was impossible to pack even more in one batch, as moving it would become inconvenient.