That's usually how they prepare piranha for whatever reason, I'm
obviously not saying that's what this is but that's the type of
preservation they use usually.
People who are in a hurry usually pay the asking price and try to
negotiate a lower rate later with a mysterious flaw they found and they
want a partial refund for.
Perhaps they are not on eBay every second or have to think about it or
have to find the item before they accept your offer, I've accept many
offers and then can't find the item and I'm on the hook for the sell not
a fun situation to be in.