I am just going to say, I know you mean well... but that is a very iffy way to be sure. If you feel they are neglected and you don't want to own a chicken from that scenerio, then by all means don't get one. However, unless you were handling the birds, and they felt thin or weak. If you noticed bugs, mites or glazed eyes you can not be aware of the bird's health. Chickens get dirty... and my do they look horrible after a rain and a muddy run.
There are people with birds living in open shacks that are perfectly healthy.
I for one keep food and water inside my bird's coops in the winter. I always have, and always will. I do not heat so this is how we help with freezing.
My suggestion is let it go, look for chickens from somewhere else... don't feel badly for caring, you meant well, but its probably best to just move on and find something that will work with what you want for your flock.