Yes, put them in a tub. Actually, after you do that, call up the supplier and request refund. See, your supplier can claim with the shipping company (whichever it may be, fedex, dhl, or ups) and get their refund that way. But to get your $$ back, you have to call them and tell them that EVERYTHING IS DEAD! In actuality, there is no way for you to tell if they are going to survive, so the shipment of corals are presumably dead. Your supplier may want to claim this shipment back, let them. Most likely, they will want to send you another shipment if stock is currently available. Everything can be tracked down on shipping detail record, so you should be in good position for a claim.
While that is done, prepare another bowl of tank water with twice the recommended dosage of I2 and give each piece a good dip, and place them back to the bucket. The bucket you prepare for them must be power head circulated (gentle), and provide medium lighting. Everyday, get each piece out and give them a I2 dip (change the dip everyday), and change 1/2 of the bucket water everyday too. Hopefully, you can still salvage most of them. HTH