She’s dead so probably not.
From the article it’s not so clear whether Alice Cooper properly “owns” the Warhol piece. It says Cindi lang “handed it off” to his manager and it ended up stored with his stuff. Does that mean she made a gift of it to Alice Cooper, or did it still belong to her? Probably difficult to prove her ownership but her estate/heirs might get into a fight about it..... turns out she only passed away in Jan. this year (2017). Could there still be any legal issue with ownership? Cindi Lang’s obituary:
http://www.legacy.com/obituaries/thetimesherald/obituary.aspx?pid=183427211