The account has many skins that aren’t offered in the League store. I have Riot Kayle, K-9 Nasus, Championship 2016 Riven, Championship Shyvana, and many others that you can no longer buy. I will attach screenshots and a list of the ones that you can’t buy. I’ve never been banned or anything like that. The account has been around for A LONG time.
Here is a URL with a lot of screenshots: http://imgur.com/a/AJPDc