No, I believe you’re correct. There’s no reason why money can’t be a consumer good like other consumer goods. Maybe someone just likes the color of them.
If the purpose of saving the money is security (i.e. safety from risk), I’m not sure if the money falls under the category of consumer good. In a sense, that’s still saving money with the purpose you may spend it, so perhaps money for that specific purpose still falls under the category of a medium of exchange.