Initially I would try to contact the IT manager responsible for the LAN / WLAN, and ask him to consult via cdp / lldp if the MACs are associated in some interface of the switch, and would request the blocking of these APs (since he has nothing or nobody associated.
PS: I believe that the date of manufacture is irrelevant, the ideal would be to identify the models, to know if it is dual band, to identify the IP address, if they are running behind controllers, or if they are stand-alone.
Thus, some action (removal / configuration) would be easier with respect to the SSID.