This case works by the principle of Real- time inventory. This means that every image of gun, witch located inside the case, shows real item, witch is in the bot right now which is servicing this case. If the item is not on the bot right now, image of the item will dissapear or not load.
This case is a bonus. You can open it for RP points, when you will receive the rank. You can recieve RP points and rank as a result of opening any cases except bonus cases. Amount of RP, which is necessary for a single opening of a case is specified on it. XP points, which you need for a rank, earning once and will not be charged.
Table of ranks is right here