Auron believed that the military would not make some mistake when investigating the Pauper Bandit group one month ago. He also didn't think that the headmaster would intentionally give him the wrong information. Hence, there was only one explanation for this. In one month, the Pauper Bandit Group had grown from a small-sized bandit group to a medium-sized bandit group.
Although this feat was not impossible, it was still difficult to do this in one month. Moreover, from the information Auron received, the bandit group didn't have any backing. The leader's background was a normal person.
The only possibility was that the Pauper Bandit Group got some backing. The backing could be anyone like a noble in the kingdom, someone in the military, a merchant group, or even the bigger-sized bandit group.