It's also highly likely that they do not care about more things if they do not care about this.
Sure it's an elevator speaker and probably you can't do much (probably! 'simple' devices are packing ever more hardware).
But something is sending those packets. What's that? Can it be hacked? What else can that device/server see? Are there other devices sharing the network with customers?
Why? It's highly likely they just don't care. Which is fine. It's an elevator speaker.