A victim of stealing Buddha's or victim of the myth that there would be gold hidden in the Buddha?
After the destruction of Ayutthaya by the Burmese in 1767, during which also Wat Chai Watthanaram must have been plundered, the temple was deserted. Theft, sale of bricks from the ruins and the beheading of the Buddha statues were common. It was not before 1987 that the Thai Department of Fine Arts started to preserve what was left. (Thanks John).