I have a question...

So.. I used sanklero's method for the exclusive skins, when I finished everything , when I got in game.. I had the headcase dlc too. but when I looked at the dlc's I own I didn't had it there.. It is probably from the data folder? Does it works with the charity case too?

You didn't buy the dlc with your method. You only give you the dlc clothes ingame, nothing more.