I also emailed them just to give them a heads up, not looking for anything in return but I think they need to know. I'm sure it isn't intentional and might not manifest itself until the stress from shipping occurs. Also haven't had that issue with regular live aquaria fish, just DD. I've purchased roughly a dozen divers den fish and only had two not make it through the guarantee period. The rest are still alive and well so I'm happy with the product.
I don't know how soon before shipping they take the pictures, but I always save the high res version of anything I purchase. Looked fine in the pictures. A small spot here and there is one thing, but this is everywhere.