Now I am going to tell you that what I use is the best in the world if we are at a show, but here I am going to say, get the critter thinking on the baits or lures and wanting them outside of the trap and they will forget about the trap that is the ticket. By the way 80% will go right in. 10 % will make you cuss a little and the last 10% will make me cuss a lot and throw things. This is just my thoughts could be wrong.
Wendall Reeves told me about a large coon that was cage shy. The coon work the trap circling-even climbing on the 12x16x28 cage he was using, but would not go in. He could tell the coons focus was on the bait inside. He placed a double doored trap between the house and the trap (with no bait or lure) the coon had been circling. He caught the coon that night.
I have caught beaver many a time in traps whether they are conibears, snares, or cage traps with the bait placed in the center with the traps place to where the beaver is caught circling and not paying attention. It is the same principle. The exception is that with a cage the animal acts as a decoy for the next animal as long as the cages are set properly.
Example: Set three large-tall double door traps in the shape of a triangle right out in the water at a level of 4-8". Place a fake caster mound in the middle of the triangle formed by the cages. Use no bait in the cages. You catch one, you,ll probably catch another. If the traps are tall the beaver won,t climb over, but circle and go in.