Is it permissible to donate the cost of medicines dispensed by insurance, which turned out to be cosmetic, given the embarrassment of informing the manager?

We understand from the exclusion of cosmetic medicines from health insurance that it pertains to products devoid of therapeutic purposes, such as cosmetic preparations that do not require a prescription. This exclusion does not include medicines prescribed by a physician to treat a defect or illness, even if they are categorized as cosmetic. If it is established that these medicines are not permitted to be dispensed at the expense of health insurance, then they may not be dispensed. Donating their value is not sufficient without the permission of the company that owns the right; rather, the right must be returned to it.