Okay, here's what I've gotten from them:
In 10 gals with UTHs and supplementary overhead red or blue lights, for daytime temps below 75. The screen tops were covered by plexi. The UTHs were controlled by thermostats (proportional or on/off? I should have asked) and set to 80 in early August -- we addressed that after they told and I had them bump the temp up to the range I keep at. Daytime temps in the house were/are 80-85. The buyer was misting them daily. The snakes were on aspen.
Also before they got back to me, they had been handling regularly -- though not every day -- and attempting to feed "almost every evening." Cats coming in and looking at the snakes were also a concern.
After conferring with me about a month ago, they adjusted the temps and opaqued the tanks for privacy. Of course, it's not just not eating, the snakes have also become extremely defensive.
Again, thank you.