Whenever I pick Graves, I can see his 2 original skins and the Riot Graves skin, but his Mafia Graves skin doesn't show up. (Because of this, I wasn't even sure Mafia Graves was released for a while until I specifically went and looked for it in store)
However, I think this is just for players who don't own the skin, since I do see Mafia Graves being used in-game or on streams quite often.
Is this happening for anyone else whose unlocked Graves but not his Mafia skin?
So I know what's happening here, but it may take a while to fix/prioritize this:
You know how we have some retired skins that we don't sell any more, like the Holiday skins? Instead of persistently taunting you that you'll never be able to select King Rammus, we have a setting that "Hides" a retired skin in Champ select, unless you own it. It seems like Mafia Graves and Scorched Earth Xerath are on that list for some reason, but still for sale in the store. We'll take a look at this list and see if we can find more that suffer from this issue.
WhippedCreame, have you tried re-starting the client like Larcent? I suspect that it may remain "hidden" until you re-log, and the client validates your inventory to show Commando XZ.