I gotta say, this has not been my experience. "I'm putting this in a safe spot" means there's a coinflip's chance it's in one of the standard spots and we can find it again.

It's when they don't make a conscious and deliberate effort to put something away that it gets ethered. Can't count the number of times my partner has lost her cell phone, her keys, her purse, her wallet, her shoes, her bicycle, her car... because she was just going through life doing her thing. Under a blanket. In a cabinet. In the refrigerator. In the trash.

I was apoplectic when she took the bus home from work, having not bothered to clock that she'd driven there. "Wait, why is there only one car in the garage?" "Oh, haha! I knew I was forgetting something. I'll call an Uber."

mega-sigh