Good News! Lucas has been found!
I posted about adopting Lucas and Maya over a month ago, then the sad post about Lucas disappearing (https://www.democraticunderground.com/116150350) a week later.
Lucas, also known as Rascal by the old owners, showed up last night at his old home. He's a little thin, but otherwise in good condition. He'd been seen at the barn on our farm a week or so ago, and I have no idea how he found his way back to the house where he had only lived for a month.
I am so glad he is safe. I told the woman that I would take him back, but she is worried that we have two kitties and a third might be too much. She's not really a cat person - she and her husband have gold retrievers that get along with the cat fine, but their son's blue heeler does not like cats and looks at them as if she thinks they might be a good meal.
I've made the offer and it is up to her to make the choice. It might stir things up here for a while, but Sabra and Maya are adjusting and we have the room for another cat. We've had more than three cats in the past - at one point we had eight, though three or four were supposed to be barn cats. (Those cats were not stupid and moved into the house during the winter and the hottest parts of the summer.)
Whatever their decision, I am so glad that Lucas is fine.