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You should definitely communicate with the seller that all the chicks had cocci and are dying, but cocci is fairly common in young birds. All chickens have this bacteria in their gut, and sometimes stress is enough to set it off. I would let the seller know, because it may be the conditions the seller is keeping them in, but it may also be that they were distressed enough that it just happened. The seller may want to make things right and give you more chicks. If not, after dealing with chickens long enough, you will find that the best thing is to let it go and deal with people you trust when it comes to chicks. You'll want to see where they keep their chicks, or buy chicks that are older than a day or two old, so you can be sure they'll survive past those first crucial days. You should only have to treat the outside chickens if they had contact with the little ones, but the older ones should be safe if they've had no contact or they're healthy to begin with. It shouldn't hurt to treat them with Corid, if you feel safer to do so. After you've given them the antibiotics, be sure to give them plenty of plain (not flavored or sweetened) yogurt, because they'll need it to rebalance the good bacteria in their digestive systems. It's not uncommon to treat a flock for bacterial infections, then lose them to secondary infections afterward because they couldn't fight it off.
