Bought a used set of wheels, TPMS or no?

I picked up a used set of wheels over the weekend and when I asked the seller if they had sensors, he said that they didn't have them.

16x8 ATX Ledge wheels
265/75R16 General Grabber AT2

From what I've read on here, many say if the valve stems are metal and not rubber, they have TPMS.

I think my truck has the sensor readers as I have the small reset switch under the dash.

Anyone have any input on how to know and how to read them?

 

Those are not TPMS Sensors just nicer valve stems than the rubber ones

 

Thanks, I wasn't too sure on how to tell by the stems themselves.

 

If you take off the cap you can actually slide the chrome sleeve off - it's just a rubber stem underneath.