I would say try another 2 times or so with frozen, then make the switch with a live rat pup. On each attempt, leave the feeder overnight. Some snakes only eat when they're absolutely alone.
I definitely wouldn't shake it or try to disorient it, especially if you go with an adult mouse. That's how snakes get bit! If and when you go to live, keeping the feeder calm, well fed and watered is your best bet. Good luck!
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