But if the car has an alarm system and it's active, this doesn't help much. If I unlock my car with a physical key, there's a three-step process I need to do in order to disable the alarm and engine kill. If your owners didn't realize their keys would work, what's the likelihood they'd then remember everything else required before driving away?
The alarm will also go off if I open it with a tool to bypass the lock... It's not my responsibility to know how to turn the alarm off. The point I was trying to make was these people did not know they could unlock their car, and gain access to their belongings, without their keyfob.
Of the three calls I handled in this in the situation I described, they were factory keys with the remote unlock buttons on the key itself.
I even had one case, where the passenger window was rolled down half way, allowing me to reach in effortlessly and unlock the vehicle.