dude, i think providing the invoice/bill is the seller's responsibility, not eBay's. The seller's listing clearly mentions that item comes with bill and manufacturer's warranty. by saying it is eBay's responsibility to provide the bill, he is obviously taking you for a ride. you can raise an item not as described issue with eBay and register a complaint against the seller. sometimes you have to twist the arm if a handshake is not appreciated.
-- Signature: I am Jack's complete lack of surprise.
-- Signature: I am Jack's complete lack of surprise.