Came into 17, asked if they can sockpuppet so they're not associated with their O5 record, told no so they said they'll do it anyway. I can't actually find an O5 thread for this user so they were likely using a different nick anyway. I also can't find their IP on the ban list.
As this user quite clearly doesn't want to own up to whatever it is they did and would rather sockpuppet despite being directly told by staff not to, if we can figure out who it is I'd recommend extending their ban.
If we can't then either they'll be a user that contributes or they'll get banned again. Not a big problem either way.