If you caught one on a rattle, I would try some more options that make noise. Maybe try going into it and present it a little differently, i.e. maybe not raise it up and make them chase it but rather leave it at one level when they are approaching. And possibly take the bait and let it fall into the bottom to stir it up in order to draw them in for a closer look. Lastly red spikes may also work well if you haven’t tried them. Different presentations may be the key.