I think your critical problem is this:The buyer will have a hard time denying he ordered your novelty ID when his/her face is printed on it.So, interception is of pivotal importance. While drug vendors can lose the occasional package, it's more problematic for you.Some ways around this include:- having some way for the buyer to easily change/alter the picture. A plastic coating enveloping the card with a superimposed face would be ideal, and should take a significant scratch at the side to peel off.- having multiple decoy IDs, all of which are obviously fake 'novelty' IDs, except for 1 real one.