I agree. I've found many things looking a bit wrecked...cameras, cell phones, sunglasses and I've always taken the time and bother to turn them in, as I would hope someone would do the same for my lost items. It never even once occurred to me that the owner would think I, the finder and person who made such an effort at return, would think ME responsible for the damage to their item.
Really, I learn something new about humanity every day.
Honestly, it wouldn't matter to me even if the owner did think that. As long as I feel I'm doing the right thing, I don't really care what anyone else thinks.