Should not be an issue for anyone with a dead fish. I only see it as an issue for people trying to abuse the system.
From the website:
Every aquatic life order is backed by our arrive alive and stay alive for 14 days guarantee
In the case of a loss, please contact our Customer Service Department here as soon as the loss occurs (including any loss upon arrival). To take advantage of the guarantee, follow the steps outlined below within your guarantee timeframe:
Attach a digital photo of the loss. The specimen should be photographed out of the shipping bag or aquarium and on a white background.
Include your name, order number, and item number of deceased specimen.
Please preserve the deceased specimen by placing it in a plastic bag, sprinkling a teaspoon of salt over it, and then freezing, in the event we would ask for the return of your specimen. You may discard the remains after we have processed your claim and sent you a verification email.