Not to hijack but...
Come to my place on feeding day, most of our snakes fly out to get there meal. We have both been tagged multiple times. I feed 40+ snakes F/T and have for years. They never were or became shy eaters because of it. I doubt they'd eat if I just left the rats in the tubs.
And OP, trying a smaller rat may help. If your husbandry is good and he has settled in for a while he may have just been nervous about the big meal. But like others have said, if he's in breeding mode he might not eat for months. Keep an eye on his weight and body condition, keep him hydrated, and offer a meal every week. He'll come around.
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