OK, I got a new (to me) SF light, which came with the box and papers (2nd SF en route, sans papers/box). Do I need to send in the little registration card to be eligible for warranty service should the need arise? Or is ownership of SF product good enough, and I can go to any SF dealer with, say a nonoperating tailcap, or busted KL1 lens, and they'll make good? I treat my gear well, so this is mainly for curiosity's sake (and help me sleep better!). thanks.