I have had a few fish in the freezer before as well-I've had to send them back for credit before so best to toss in the freezer while you find out what the seller wants to do.

And now I'm imagining a bunch of people weighing out and splitting up ashes. Weird. The shelter up here actually pays someone to bury the euthed animals on their property because it's cheaper than cremation and they can't even get a deal on it.