The day I threw away those traps was the day we had to hunt for it and found it under the dishwasher.... WITH A SINGLE PAW STILL IN IT!! no dead body attached. a lone sad paw.
So now we have live traps. I use butter. It works. I catch one mouse at a time and let him go free. I've been told that the same one just comes right back in the house but I don't think so.
For it's size it was hard to figure out if there was a mouse inside even if I tipped the closed trap back and forth. The trap was very sensitive even if we mistakenly brushed past it. So I devised a little experiment.