If I couldn't find it, I would just quit looking for it and go to work.
If I didn't see it anywhere, I would just forget about it and head to work.
この場合、次のような言い方ができます。
A: What would you do if you couldn't find your wallet at home before you went to work in the morning?
「朝会社に行く前に財布が見つからなかったらどうする？」
B: If I couldn't find it, I would just quit looking for it and go to work.
「見つからなかったら、探すのやめて仕事に行く」
または次のようにも言えます。
ーIf I didn't see it anywhere, I would just forget about it and head to work.
「どこにも見つからなかったら、財布のことは忘れて仕事に向かう」
ご参考まで！
カナダ 
