Indeed, several bailiffs were collecting grain in Jiangding Village, and Yang Heshu, as the County Magistrate of Luojiang County, though he didn't bring many servants, had many at his disposal.
Since the office was closed for the festival anyway, he quite straightforwardly misused public resources, taking out a portion of the reward money and directly expropriating the bailiffs in the County Governmental Office.
Even the chief clerks and secretaries of the county were pulled out by him to go down to the countryside to collect grain.
As for where the County Governmental Office got so much money, of course, it was because he had paid in advance.
Indeed, the grain was purchased in the name of the County Governmental Office, because, as the County Magistrate of Luojiang County, according to the imperial law, he couldn't conduct such business within Luojiang County.