What must be done concerning the incentives and bonuses disbursed in customs departments when it is difficult to ascertain their source, knowing that the supplication of those who consume unlawful earnings is not answered?

If the work of customs departments is unlawful (haram), then the wages, incentives, and bonuses for working in them are also unlawful if all of their funds are unlawful. However, if the department's funds are mixed, there is no harm in accepting and benefiting from the bonus. In the case of unlawful funds, they must be disposed of, and their owner is not permitted to benefit from them unless they are poor and in need, in which case they may take only what suffices their need. Among the harms of consuming unlawful wealth is that it prevents prayers from being answered.