Good info there from Treeing Walkers. I trap a lot of coons in the city. If I have a trap shy coon, I tip over a trash can, place the trap inside covered with trash. Haven't missed a trap shy coon yet using this method. Type of bait isn't usually the problem, something else is causing them to stay away. Location, setting, not camoflauged, etc. Another thing to keep in mind, is to make sure the trap is setting firmly on the ground. If it wiggles when they step on it, they won't feel safe and won't go in.
Rocky Mountain Wildlife Studios