Hello, I just purchased a used EW-83e lens hood for my Canon 10-22mm lens... I was wondering how do I make sure if it's authentic and not a generic one? I've seen original ones and there is a red dot underneath what says, "Canon EW-83E CANON INC. MADE IN JAPAN". Is there any other thing I should know? Does it have a specific texture on the inside? Any input would be appreciated! Thanks.