Bought an M-fil 200 from the auction site (US seller, good feedback). Seller tells me the Dunlops don't come with a warranty certificate/paper? Is that true? She tells me in case of probs, I need to return it to her, her to distributor, distributor to Dunlop, which will determine if it's a reasonable breakage. Other seller post that such racquets come with a 1yr warranty, but I'm not sure if any warranty certificate/paper (except for the bill of sale) is accompanying the racquet or should. Any pointers to verify the authenticity? Holograms, etc?