‘Lost’ has be defined as missing or unable to be found. It can also mean something that was wasted or not used in a valuable way. The first definition – missing or unable to be found – describes my experience.
Have you ever lost something? Losing a thing is unsettling. When I lose something, I look around, I retrace my recent steps, and I rack my memory. For example, I’ve lost my phone on occasion. It’s helpful to be able to call it and track down the ring (unless it’s on silent). I’ve also lost my keys. But, usually they’re either in a coat pocket or in the kitchen.