Have you seen this track?

Keep digging, maybe you will find them yet. Are you sure they aren't still attached to another piece of longer track or all still attached to each other where you would pass over them in the box looking for something smaller?

Actually, two of them were connected to other pieces of track the last time I put away a layout, but those two were already found before I realized the rest were missing. I've searched to the bottom of the box, and in other bins too, and under the couch, but still no sign of the tracks.