How do you leave the carcass and how do you set it up with the traps?
Good question.
I throw out carcasses wherever I have had luck in the past and areas that look like might get hunted by cats. Brushy creek bottoms and doug fir reprod about 15-20 years old being preferred. Then areas where hopefully birds don't discover them so kind of invisible from the sky. Old skid roads in mixed age fir plantations get a lot of cat activity too.
As most of us know, cats cover a carcass up when they're done eating after finding one, and one adult beaver carcass will usually last for 4-5 days of eating. Which is why I figure I have about 4-5 days before first look over on the carcasses. In Oregon we need to have foothold traps at least 15' away from sight baits. What I used to do was take the carcass away and dig out a dirt hole with a beaver haunch and either set it with a body grip, snare or foothold. I was getting some refusals maybe around 20-30% of the time. SO, I got to where I try to disturb their doings as little as possible and am getting better results.
I finally figured out that a covered up beaver carcass is NOT a sight bait per our regulations and therefore I can create a walk through set next to the carcass. As long as no part of the carcass is visible. That new strategy has been working better. I use a little beaver castor or otter musk to try to make sure they walk through where I want them to.
On the two sets yesterday that did not connect nothing had visited and being that each one was within a half mile of another set that did connect it's possible that one cat had worked both carcasses and I caught it. I'll find out maybe tomorrow if that theory holds.
Today I'm home skinning and such.
Did set up another couple of civet hits yesterday with 120's. On the civets I set the 120 right next to the carcass as the little guys circle carcasses constantly eating on different parts of the carcass. I cover up that side of the carcass with ferns over the trap as they like to be under cover when possible and also to make sure that no birds get caught. And to keep birds off my civet after one gets caught!