Is it permissible for public sector employees to purchase beverages worth the value of their remaining vouchers to take home?

The reliable way to determine the ruling on benefiting from a beverage voucher is to refer to the conditions set by the issuing company. If the company grants it to employees for use only during working hours, then it is not permissible to benefit from it outside of those hours or for anyone not entitled to it. However, if the company grants it to employees so they may use it as they wish, at any time, and for anyone, then there is no objection to using it to purchase beverages and take them home.