I had probs not catching rabbits in a boxtrap, but did catch one big 'possum with bait. An old timer told me a rabbit won't go in if he can't see a way out and no bait needed unless you want trash ( 'possums and the like). I promptly removed the end of my box trap and replaced with hardware cloth or small fan grill, quit using bait and started getting rabbits, lots of rabbits. They will chew through the hareware cloth if left unattended too long ( i reccomend once morning and once evening). That's why I started using fan guards. Could make a weave from coat hanger wire as well. Worked for me, but your milage may vary.