Poor Yafe...so many injections...but he's in great hands, so he wouldn't dare stay sick. (I hope!) Your prompt attention taking him to the vet was
I know & agree with your vet, nothing you did caused this, & also that it's impossible to prove that he was already ill when he was shipped, but certainly the journey
(without heat) didn't help. I hope you some get satisfaction from the seller, the 2nd communication sounded much better than the first, but it remains to be seen.
I'd be really concerned about the flailing, jerky movements he does too...I hope that's self-limiting with his infection but only time will tell. We're all pulling for Yafe-
he didn't deserve this & neither did you.