If nothing else, push for a partial refund.
I've gotten them many times off ebay if something was damaged in transit, but not destroyed. A lot depends on if it was easy to tell that the damage was due to incompetent packing, or the shipper. If it was the shipper, you usually can't get a partial refund - it's either turn it in and get full refund, or nothing. And then you don't have the machine and the shipper will probably trash it after giving the refund.
Contact the seller no matter what - if you and the seller can't come to an agreement - "escalate" the case and Ebay will decide. Ebay has the Buyer Protection so you will at least get the cost of the item back, though in some cases if it's not the seller's fault, you may have to pay shipping to return it. Though you may only need to return it to the shipper if the seller is going to file a claim for damage.