What is the ruling on a treasurer taking the excess amount found in the fund, knowing that he makes up for any shortage from his own money?

The treasurer is entrusted with what is under his hand, so it is not permissible for him to take surplus money except with the permission of the responsible authority, even if it is to compensate for a deficit in the fund. And an entrusted person is not liable for what is damaged while in his keeping, except in cases of transgression or negligence.