Robert Cormier
Get them to damn themselves piece by piece. Example: "no, the box has no legal implications" etc. Then send off a few more questions. As they say, "keep giving them just enough rope to continue hanging themselves". (Y) In my humble opinion, your letter lays all your cards on the table for everyone to see what cards you will play. From its submission they can deduce your strategy as well. It also leaves you without additional cards to play in the future.