They sometimes black when you send them, check your saved copy and see if there's anything on it, if it's blank, they haven't got it. If it did arrive blank, they will allegedly call you to tell you.
When you order on line you provide the relevant details and on the same page it says, send order or similar.Is there any reason why the ballot paper couldn't have been set up in a similar way rather than the convoluted way of returning the ballot paper as adopted by the club?