Oddly enough one of my Royals went off her food when I moved her to a bigger viv - until I put her back in her old, small viv then she ate the next day .
As regards the hairdryer method .. the hairdryer is just a part of the trick .
With many Royals It’s not just a case of warming the mouse /rat up .. they are nocturnal so most will only be active and want to feed in the evenings ( there are a few who will eat anytime of course).
Anyways , in my experience, Royals need to feel secure before the will strike and eat . I let the frozen rodents thaw out in the snake room and that gets the snakes in the mood to eat - after a few hours they’re all ready and waiting . I make sure they are safe under a viv then immediately dangle the warm rodent in front of the hide entrance , feed in dim/low lighting so the heat pits can zoom into the warmed up mouse/rats heat signal ... it it shows interest ( as you mentioned) they normally get it straight away but if not RE-HEAT and offer again whilst warm .. keep repeating until it takes it under the hide .
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