[V] IdolNinja
Volition Staff
My guess would be that it was in a directory other than Steam, but someone said he didn't even try to hide it. Which makes me think it was something glaring like a folder called "pirated games" or a "crack.exe" or something, as not everyone would instantly think "pirated" when they see a non-Steam install directory.
All releases of Saints Row IV are steamworks and requires Steam, including boxed retail. His linked account showed clearly that he doesn't own it.