One of the Principles of Insurance is that the insured person can claim compensation only to the extent of actual loss. If the employee is being paid 100% of their wages by the employer, and addition pay would be Unjust Enrichment.
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Section 22 of the National Insurance Act provides that every employer is entitled to withhold the payment of any wages for the purpose of ensuring that the aggregate of the wages does not exceed the amount of wages which would normally be payable.

You would think that the Minister responsible for NIB would be aware that the benefits section the NIB website says the following:
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<B>If full salary is paid while an employee is on sick leave, does the employer have the right to request the Sickness Benefit cheques paid by National Insurance?</B>
Yes. The employer is empowered <U>by law</U> to adjust his/her employee's sick leave pay to take into account the benefit payment/s received from National Insurance. So, if a worker receives full salary while on sick leave, then the employer has a right to adjust the salary either by deducting the difference National Insurance paid, or by requesting the Sickness Benefit cheques.
<B>Does the employer have the right to find out what the employee received as Sickness Benefit?</B>
Yes. The National Insurance Act, Chapter 320 Statute Laws of The Bahamas, directs the National Insurance Board to comply with any reasonable requests made by the employer in terms of his/her employees' benefits.