(this is why i dont buy stuff on R2R thats not local, no accountability for dishonest sellers)
Paypal will often make you send it back at your expense, even if the seller lied about condition. So you'll probably be out shipping, but as many on here have noted it should not cost much to send back domestically via USPS. Demand a 100% refund of your purchase price after the tracking shows item returned. Make sure you upload the tracking # to the dispute and contact paypal as soon as it shows delivered to process your refund.
If for some reason paypal doesn't cooperate, call the bank for the credit card you used for the paypal payment and try to get them to chargeback to paypal.