Must be nice :)
I think there are a lot of people that don't have tendencies towards systems/self rules to solve issues like this, so they casually smash through life care free and forget where they put their keys "this time". (based on many people I know)
My keys are often in different places, it is just that the list of "sensible" places isn't very large so if I have forgotten checking them all takes practically no time
EDIT: I should say not a system I developed consciously, I do have ADD so my habit of putting things in sensible places generally might be an adaption to that, though if so it happened before I even had keys to lose
Where other people may have made no considerations at all where they put stuff.
The only considerations are: Is the place convenient (read nearby when I'm likely to be putting things down)? Are they a flat and stable surface?
That's it. I feel like if people don't make those sorts of considerations surely they are just dropping shit on the floor
Surely there are natural places those things end up?