Insurance agents always say that. What that means is that it is covered under your contents value, but so is everything else that you own, clothes, dishes, silverware, furniture, etc.. I would check to see if they have a maximum coverage for those and what proof is required that you owned...
In My opinion and for me, none of the value lies in the case unless it is a collectors case that is different from the mass produced plastic ones. I have a few of the metal tins and an Army of Darkness case that is made out like the book and those would add value, not a case with a piece of...