Is it permissible to spend 17 dinars that were mistakenly transferred as compensation for 150 dinars of overtime pay that has not been disbursed for two years?

The answer is based on the preferred view regarding the issue of gaining control (over something that is not rightfully one's own). As long as the reason for the right is not apparent, it is not permissible for him to take this amount of money except with the permission of his employer. He must return the money and then demand his right.