nowhere to be found
Unable to be discovered; completely gone or vanished. I swear I was just holding them in my hand, but now my keys are nowhere to be found! The box says it comes with batteries, but they're nowhere to be found.
nowhere to be ˈfound/ˈseen
(also nowhere in ˈsight) impossible to find: They searched the house but the necklace was nowhere to be found.By the time I arrived at the station, the others were nowhere in sight.