If you perform it correctly--the two cards(that's all there are)are examinable. That's what makes it interesting. See link below to MJM magic where product is described in detail: MJM Magic--2 card Mysteries
I carry it in an empty card box and remove it in front of the specs that way--so far no problems.Your're right and they should have put some solutions to that problem in the instructions.
Now to investigate "pocket levitation" to see what that's about--Hummmm!