I think 5 days is the limit for a puffer not eating, I could be wrong. I know my puffer in my other tank loves squid, he actually didn't like when I put garlic on it but he still ate some of it.
I just cut up little chunks of squid and he eats them like candy. His name is "Munch" cause he likes to eat.
Noah was a drunk and looked what he accomplished, no one's asking you to build an ark...