"stolen copes" What does it mean? I need to give you the context. I´ll write ii in "message".

Hello. Can you help me?

This is the context of "stolen copes". The author is describing a furnished room in N.Y., where a young girl Dulcie lives, at the end of the nineteenth century. Everything in the room is a little bit depressing or in bad taste. There is a picture on one wall , "a violent oleograph of a lemon-colored child assaulting an inflammatory butterfly. This was Dulcie´s final judgment in art; but it had never been upset. Her rest had never been disturbed by whispers of stolen copes; no critic had elevated his eyebrows at her infantile entomologist."

What does "stolen copes" mean here? I understand all the rest of it, but not that. Thank you very much.