ebay required insurance

Am I responsible for litigation lost property with PayPal?
I recently posted an article for about $ 1000. I sent the object and subject tracking number was never updated. With their almost lost by USPS. I have sent to the address confirmed and certified mail, requiring a signature. The buyer filed a dispute with me and now under investigation for paypal. Pal Meet "status Art "I settlement system very concerned about the loss of this controversy. I need someone who knows what is or is pass or if someone had dealt with this situation. I mean, should not be responsible for right? I offered my insurance in an auction eBay and the buyer does not buy. USPS State did.
I'm confused and it seems that you may be also. Before entering the center of Regulation PayPal disputes, you need the right information. It has been the subject sent USPS or UPS? Ceritifed mail I sent? This service is usually USPS used for documents requiring a signature, but does not provide insurance. Not correspond exactly to $ 1000.00 item. Did you pay a delivery reception? Just the tracking number because the issue has not been updated thou forsaken me? Did you call 1-800 – ASK-USPS and talked with a representative of the customer service?
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