As @Southernsitter says it’s only funny after you’ve found them.
Similar thing happened to me, a very sad senior cat had been taken in by the owner just a week before I arrived, she said “Don’t worry if you don’t see her” which broke my heart.
She was in the house … somewhere. Her food went, litter tray used but I couldn’t find her, kept looking under the owners bed without luck (I was looking from the side and there were storage drawers underneath) … she couldn’t be under, then I looked from the end, there was a tunnel in the middle and there she was, just saw these huge eyes.
Pieces of chicken and three renditions of “What’s New Pussycat” had her crawling on her belly … a couple of days, more chicken, more singing and we became the best of friends …
She probably just wanted the singing to stop!!