I am creating a fangame. Specifically a game where you can open weapon cases from Counter-Strike: Global Offensive for free and collect or trade skins that you obtain. The entire game source is my own work, except there are two files containing names and parameters of items from CSGO. I want to distribute my game's source including these files.
I am ready to retract these parts should Valve contact me regarding intellectual property, however I'd like to put some kind of disclaimer in case somebody else used my source code and then got hit by Valve or anything. To state that I don't have a right to the IP contained and that the use of these files is at the risk of the user, not me; so they couldn't point at me, claiming the game was fully open sourced by me under MIT (which I plan to use). What would the best approach in this be?