PM me if nobody has sorted you out
But briefly, you remove the dice from box, and place it into a top hat or a bag or similar, and say "would you like to see the dice jump back into the box visibly or invisibly" they say visibly. You pick up the die from the hat open up the die box door, and place it inside. (if they say invisibly use the old its jumped and jumped back gag, then say i'll do it visibly) That's your switch as such.
I think its pretty self explanatory from there, at the end it really does jump invisibly back where you started into the hat or bag.
Matt Colman.