Back when I used to work with Coastal Plain milk snakes, I had a devil of a time with them in the late summer and early fall. They KNEW when it was time to brumate, and it didn't matter what the temps were, or what tempting food morsels I offered them. They knew it was time to be chilling down, so they were uninterested in feeding.
Maybe it's visual cues, such as shortened daylight hours, or any number of other things that we don't have any way to detect ourselves, but this time of year, some reptiles are just going to go off feed, no matter what we try to tell them.
If you can, once they have been without feed for three weeks, try chilling them down for a while. Normally when you warm them up again, the appetite gets turned back on.
I can't say for sure this is the situation with your animals, but that's what I would do here if I knew they were healthy and there were no other extenuating circumstances involved.
Good luck.
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