Holy mackerel. First of all, I'm sorry about your birds! I'm new around here, but it sounds like you've had a rough year.
So far as your predator...Not surprised to hear your F&G is so very helpful. /snark I love the relocate and release...right. More like "relocate and run like heck...backwards." LOL What idiots. I was reading earlier today comments from people in various parts of the country having similar troubles, relating to bobcats, mountain lions, et cetera. (A mountain lion was struck by a car and killed in CT; they and their signs have been seen in the area for quite a bit of time, but all of the local DNRs still insist on denying it.) I also don't understand why these animals are *such* protected species that we either have to just accept the property damage or pay huge fines for protecting ourselves and animals! If it is this close to people, and it IS a bobcat, mountain lion, whatever, it may (will?) eventually get bold enough to go after other pets...or kids. Hello, F&G?
Good luck to your husband and/or the trapper. Nature is beautiful, but sometimes the more dangerous aspects of it need to be reminded there are lines that shouldn't be crossed. Otherwise people's lives, or at least peace, are put in danger.
Are there any other ways you can protect your birds or scare the predator enough that it stays away?