I think being honest is always the best policy. Your reputation and your integrity determine your long term career prospects… not to mention being honest is just easier. When you are honest you don’t have to remover anything. I think I might be paraphrasing Mark Fwain there.
If it were me. I’d be honest with your client. Be honest with your boss that you were honest. If they want to fire you for being honest it will reflect poorly on them and be a great interview story. Of course this is easy to say from this side of the computer (or iPhone to be exact). Make sure you have the financial ability to get fired!