Damage from bad packaging without a full refund is grounds for negative feedback and a report to ebay.
The problem with ebay feedback is that an accurate assessment is impossible without retribution. (Unless you do yours last.) Really, they should do away with the neutral feedback choice. When I go to the store and buy something, the experience is neutral. All transactions are neutral, or at least non-negative, unless something extraordinary happens. But, if you don't choose positive, it looks like you are giving a negative report, and the vast majority of ebayers will give you the same rating in kind, even if you are awesomely awesome. Positive is the defacto neutral, and anything less is negative. Off topic rant concluded. :-)