Kayıp [lost]: {adj.} having gone astray or missed the way; bewildered as to place, direction, etc.
Eşyalar [objects¹, things², beings³]: {noun} ¹anything that is visible or tangible and is relatively stable in form.
Kayıp Eşyalar [Lost and Found]: {noun} a room in a public place for items left behind and from which the owners may retrieve them.