An honor greater than a windfall
Refund it. Discipline and honor prevail. It is a soldier's shame to profit from a clerk's mistake.
You paid ¥1,000 for a ¥500 purchase, but received ¥4,500 in change by mistake. The cashier hasn't noticed. What do you do?
Refund it. Discipline and honor prevail. It is a soldier's shame to profit from a clerk's mistake.