Later, a mokkan (a long and narrow wood plate with a script written with a brush) written as 'Koreharu-gun' was excavated so 'kore' and 'I' were homophonic and the theory that korehari was koreharu's writing error became stronger.
後に「此治郡」という表記の木簡が出土したため、此と伊は訓読みで「これ」の同音異字で通じ、上治を此治の誤記とする説が有力になった。