I do not know why anyone would go through the trouble of getting keets, raising them to be old enough to go outside and then send them off to be killed? This may sound harsh but that is what will happen if you “just” let them live in the woods. Guineas are almost blind at night and they will get picked off by raccoons, owls, coyotes, fox, stray cats, dogs etc. Raccoons are everywhere and even if you have never seen a coyote they are there (they are even in suburban areas). You can read many posts in this forum about people who let the birds live in the woods and eventually they all disappear. I have 45 guineas and they all go into a coop at night. It is very easy to train them to do this. I only lost 1 bird this year (she went broody on a nest we could not find). They have eliminated all the ticks, stink bugs, Japanese beetles and other insects in the yard and garden. They tell me when a strange car comes up the driveway, when a predator comes in the yard or a hawk is flying overhead. And they amuse me! With all the positives that they provide why would anyone want to loose any of them? So if you do not mind them disappearing in 6 months or so by all means let them go off to live in the woods. But if you want to enjoy them for years to come, train them to go into a coop.