This is one of the weirdest things I have ever seen. I've never seen a BD-type fade to a shade that light. IMO they don't look well but it could just be because they're so pale and the lighting in the photos makes the fins look dark. I would definitely try worming them just for the heck of it.
Do you know of anyone else who got the same fish from that or other shipments? I'd be interested to know if others experienced it. I haven't seen any threads here about BDs fading -- it seems like with all the people buying discus, someone else would have seen it and reported it had it been widespread.