http://resolutioncenter.ebay.ca/
Open an Item Not As Described Dispute.
IF you purchased from a US seller who used the Global Shipping Program, you will probably be refunded and asked to trash the damaged item, since PitneyBowes who run the program don't want it either.
If you purchased outside the GSP, you may be asked to return the item with tracking. Once you can show that the seller has the item back, Paypal will refund your original payment, but not the return postage.
Some sellers will refund themselves, to avoid the 'Defect' on their selling account. They may ask for the return or they may accept a photo of the parcel and/or the item.