What does it matter?
The person who has lost the keys will know, nobody else needs to know.
Hand them into the police if no joy, thats the first place i would go if i lost my car keys.
Just a question! If it were me who'd found them, I'd knock on a couple of doors in the immediate area to see if they had lost their keys.
Have I explained myself satisfactorily boss?
Well thats a pretty stupid idea, i would rather the rightful owner were reunited with the keys, like i said the person who owns the keys would obviously know if they were theirs or not.
What are the chances of 2 people losing the same type of keys for the same car in the same park?
Knocking on some random persons door offering car and house keys to somebody you do not know is a bad idea.
Thats like finding a gold Rolex, giving a full description of it and giving it to the 1st person who claims it to be theirs Chief!