I shipped this frag and when I packed it, it was a frag disc full of open and healthy Rasta zoanthids that had been fragged for no less than 6 weeks from the look of the growth. I've shipped literally thousands of packages containing tens of thousands of coral fragments. To my knowledge the package arrived on time with a message thanking Madreefer. Not until 5 days later did she contact Madreefer to say that they had melted (with no photo showing so).
$155 for 18 Rastas ($8.60pp shipped) is a steal to start off with, I'd say that proves Madreef isn't out to get anyone and I really don't know anyone that would offer any kind of guarantee after 5 days of no contact.
Sometimes zoas don't fair well in new water, that's just a fact in this hobby and if the problem isn't apparent after a couple days I don't think the seller can be blamed. If there's even a chance that there's a problem I would assume the buyer would contact the seller immediately, expecting anything after 5 days of them being in the tank just isn't realistic.
Though I am Madreef's friend, if he was at fault I would suggest he rectify the situation (though I wouldn't have to) and in this case with the facts that have been presented, I'd say he's in the clear. It sucks the coral died, that happens to everyone at some point in this hobby, but if it were the sellers fault he should have been contacted immediately, not 5 days later.