They would only be liable if they were--and you can show or prove that they were--negligent, or unreasonably careless, in (for example) how they stacked their boxes. If they did nothing wrong and you simply happened to pull a box down on their foot, they were *not* liable: a store is not your insurer (and the store's insurer is not *your* insurerer, either) and they are only responsible for your injuries if you can show fault.Even if you think you can prove fault, bear in mind that if they don't want to pay voluntarily, you'd have to sue them. But in a lawsuit, you can only get your out-of-pocket (not paid by insurance) medical costs--the type of injury you describe will not support an award of "pain and suffering" compensation, which is generally reserved for injuries causing months (or more) of significant disability or life impairment. It may not be worth your while to try and sue them.