If an item is damaged in shipping, you should contact the Seller immediately so that they can file a Damage Claim. The responsibility of pursuing a Damage Claim lies solely with the Seller. However, you will need to cooperate with the Seller and the shipping company in any manner requested. Often, the shipping company will want to inspect or recover the damaged item.
Keep all of the packing and materials exactly as you received it. Do not attempt to use the item or plug it in, as this may result in further damage. Do not attempt to disassemble or repair the item unless the Seller first agrees.
If Buyer and Seller can not agree on a course of action to follow, a "Dispute" may be filed with Audiogon by submitting a transaction dispute support ticket.
Generally speaking, the Seller is expected to issue a refund to the Buyer, and recover the money by pursuing the Damage Claim. Shipping companies generally pay the Seller only, and this may take some time. The Buyer should not have to wait until the claim is processed. Essentially, it is the Seller's responsibility to deliver the item to the Buyer in an undamaged condition.