We are losing stuff when they don't have any home to go back to when you are done using them. This is why it is helpful to make a home for everything - A place where it goes back when you are done with it.
My car keys have a place to where they go when I'm driving, new cards don't use keys to start the engine so you find yourself wondering where would you put them now?
A small gadget is a small hook which you can stick to any where you want so when you park you know where to find them.
I have a pen on every desk I work that way I never look for a pen when I work at home or the office. A spacial attachment allow me to place it back when ever I'm done with it. Trust me, I have this pen for quite some time and it never got lost.