My parents have been feeding 3 cats outside for varying quantities of time ranging from a couple of months to 2 years. We trapped Cat 1 in the beginning of July, about one month after my diabetic Yittle succumbed to cancer. When he arrived he did a small bit of damage to the room. You'd be amazed at the velocity they get when you let them out of the trap. He kept trying to stand on top of the top portion of the window frame, which didn't work well. But we installed a window sill perch in the room and that sufficed for a security perch. It took awhile, but that cat is now named Kerry and he sleeps in my bed cuddled up in my arms every night and follows me everywhere I go in the house. He also gets along perfectly with every single one of my 6 other cats, including the cat that doesn't get along with any of the others. The vet estimated he was 1-3 years old, although he's so small, around 9lbs and the smallest cat I own that I figure he's closer to 1 or less. My parents had only been feeding him for about 2 months. So cat 1 down, we turned to cat 2.
Cat 2 would get within 4 feet of my father while outside being fed. Unlike Cat 1 who he couldn't get within 20 feet of. They assumed that this meant he was tamer But again, you open that trap door and wow can they climb the walls. It wasn't that hard for him to jump from the perch, to on top of a cabinet in the room and then I guess he tried to walk on the lamp fixture and failed. Hard to say, we woke up to shattered glass. This happened on day 3 or 4? After he'd been neutered and returned to the room. We're starting week 3 now and he hasn't done anything since but there's still no way I'm getting within 3 feet of him until his parasite fecal test comes back negative later this week. Assuming it comes back negative, obviously postive means more treatment. Vandal as I like to call him mostly sits in his cat condo or on his perch. He looks at us when we talk to him, he's eating heartily and he loves the cat treats. When we first got him, he was spraying things but he appears to have stopped. We'll see how that goes. We plan to keep him for a month or two and see what he wants. If he wants to be inside and can resist the urge to spray then he has a forever home at my parents house. If he likes humans but still wants to spray, then he's got a forever home at my parents in a warm shelter built outside, with daily food, water, and love. If he hates us, then we're going to have the vet tip his ear and back out he goes to their backyard (with the same shelter, food and water) and he can stay or leave as he pleases. But at least he'll be neutered. Although he'll still have to deal with the fact that my parents have a pair of foxes running around their back yard who appeared to be hunting the cats. They'd found where the cats were sleeping, were seen often around their feeding station etc. We might have to build a shelter in a tree.
Cat 3 is hopeless, fed for over 2 years and he runs about 50+ feet away every time they come out to feed him. He's on the list to be TNR'd as soon as he's trapped. However having trapped 2 cats from the yard before him thats going to be quite the job.
While Vandal's feats were a bit impressive, I've trapped and tamed a good number cats over the years myself and most of them did some property damage during the first 24-72 hours. Anytime you open a trap inside a powder room thats around 6 feet by 3 1/2 feet you've got yourself a pretty explosive feline in a very small area. Usually looks a bit like a shotgun blast - away from you but floor to ceiling and wall to wall. I've had them jump straight at the door clearing the top hinges, climb the wooden door, hang on the door, climb the tile walls, climb the window, climb the fixtures, tear loose tiles off the wall, rip fixtures off the wall, attempt to vault through the window glass - you name it. As of this moment, every single one of my previous attempts has become a devoted, loving, happy housecat. Several of them are waiting for me to finish this and feed them breakfast so they can fill up and then come to bed with me. Will Vandal be as successful, hard to say. But its impossible to tell in the first 2 weeks. While they are feral - in that they were born outside, lived outside, and their only interaction with humans was being fed by them outside and they were never handled by a human until they were trapped. That doesn't necessarily mean they cannot adapt. The older they get, the harder it is, but a cat who'd get within a few feet of a human outside is certainly worth a few months effort. In the mean time he's been vaccinated, neutered, treated for parasites, worms, fleas and ticks (and he had huge ticks on him when we got him). He's also had all the moist food he could eat and has filled out nicely. If he has to go back outside, he goes back out as a much healthier cat.