There is nothing wrong with eating them now. They will be very tender and you will not get as much meat as if you wait, but they should be good. How do you plan on cooking them? I would not marinade them very long as the acid in the marinade might turn them mushy as it breaks down fiber.
Not sure here you are located or what your pen looks like to guess on predators. It would take a pretty big bird of prey to carry off a 4 pound chicken. Since you mention raccoons I'd guess you are in North America. Most flying predators would be more likely to eat them on the spot unless they were taking them back to a nest of young, which is unlikely this time of the year north of the equator.
A raccoon is unlikely to carry the whole carcass away either but maybe. Certainly cannot consume it all in one spot, bones and all. I'd be thinking more in terms of a bobcat or some type of canine, fox or coyote. Foxes can climb quite well and coyotes can really jump, but bobcat can really climb. Their typical method is to carry off the carcass and bury what they don't consume for later. But I've also seen a fox come back the same time every day to grab one and carry it off.
Don't believe the myth that critters only hunt at night. I've seen plenty of bobcat, coyote. and fox out hunting during the day. A friend saw a bobcat take her rooster out of her kitchen window while she was washing the lunchtime dishes. I've seen and trapped raccoons and skunks in the middle of the day. The one that surprised me was when I saw a possum eating out of my compost pile at 1:00 pm on a bright sunny day. I thought possum were only nocturnal but not that one. None of them were sick.
