Any thoughts as to what these wires might be? Red/black/orange-ish/yellow.
Use a DVOM (digital volt ohm meter) to test each wire to ground for ANY AC/DC voltage. Test the mix of each wire to each wire. While this does NOT rule out any kind of voltage it gets you pretty close to comfortable. Then use OHM setting and check for essentially an open circuit on each combination of wire.

Once you have ruled out live active power, and open connections on each wire, use a ringer like a Fluke ringer/toner and trace the direction of the wire through the wall, potentially to its destination.

Now, if you DO find voltage (greater than about 60mV), or any ohm reading less than ..... 40Mohms, I would turn off breakers to see the voltage vanish, or if there is Ohms, look for physical items, like a security keypad, boxes/transformers/other physical items, or even open doors/windows with a switch sensor on it.