I don't see where the OP stated "there are no stock meds", and actually the OP described their practice as administering meds from a stock supply.
In correctional settings patients aren't typically allowed to self-administer medications from a patient-owned supply, medications are typically administered by staff. The OP also said the medications in question were about to be returned to the pharmacy, typically pharmacies don't accept returned meds that have been dispensed for someone to self-administer, but they do take back medications delivered to a facility to be kept under the control of facility as their stock supply.
It's pretty common, particularly in settings that aren't administering large volumes of medications, to only keep enough common medications in stock to last until an additional supply arrives when a medication has been ordered for a particular patient (or inmate). When this additional supply arrives from pharmacy it will typically be labelled with the name of the patient (or inmate) that it was ordered for, but that doesn't make it a patient-owned medication dispensed to them, that just makes it easier for staff to find the medication.
I think nurses in a number of settings mistakenly assume that when a facility only keep on hand the medications they need to administer for currently active orders that these medications are specific to that patient (that they are patient-owned medications), which isn't the case if they are being administered to patients, as opposed to being self-administered.
The OP's question was what is required for a nurse to appropriately administer a medication per practice acts, regulations, etc. The components of appropriate medication administration are the correct medication and dose (ie metoprolol tartrate 25mg) the right frequency, route, and to confirm that you have the right patient that the order is written for. The history of how that 25mg of metoprolol came to be in the facility's possession does not factor into the requirements of appropriate medication administration.
I'm not sure why you feel the need to respond to my views with aggressive bullying behavior, I'd welcome any examples of where I've been disrespectful or mean but I'm honestly not clear when that occurred.