I just bought a new lens for my rz67 and on close inspection I found what looks like a scratch/scratches in the corner of the front element. The scratches are shaped like lightning (never seen anything like it) and I think they're just in the coating, but I can't be sure. Should I be worried? I got a pretty good price on it, but it was advertized as "superb, close to mint condition", should I return it? Thanks.