なくなっていた

was gone

→ 無い
phrase Rare #26,640
was gone Describes something that had disappeared or was no longer present; with people or conditions, it can mean that something was no longer the case.
JA: 冷蔵庫に入れておいたケーキがなくなっていた。
EN: The cake I had put in the refrigerator was gone.

彼の心配すっかりなくなっていた

His worries had completely disappeared.

驚くこと金がなくなっていた

Surprisingly, the money was gone.

目が覚めてみたらスーツケースなくなっていた

When I woke up, I found that my suitcase was gone.

驚いたことに私の財布なくなっていた

To my surprise, my wallet was gone.