What should I do with this car key I found?

I found a key attached to an electronic fob on the street, and picked it up with the intention of finding the owner. Unfortunately, I’m not sure that’s possible. The key has no markings other than a brand name (Faultless) and a serial number on it. The key fob has the usual lock/unlock/alarm/open/close buttons on it, and a whole bunch of serial numbers on the back. I called a car dealership about it, and was told that unless there’s a VIN number on it, no one will be able to track the owner down.

My question is, does anyone know if there’s any way to track down the owner and give back the key? Are the serial numbers on the fob useful at all? If so, whom would I contact? Example: a tiny sticker has the serial ESN6BC007 on it. Another sticker has Z823 written in large script, then 18008159 rev 001 in teeny tiny lettering underneath. Yet another sticker, with the name of the manufacturer and various code approval symbols has the serial number 18006198R001 on it. There are other serial numbers embossed in the actual plastic of the fob.

Any suggestions?

(And yes, I tried triggering it on the street where I found it, and there was no response.)