Magic Coin Box

This is a total stunner. Borrow a coin, have it marked in a way that separates the coin from any coin in the entire world. Make a magical gesture and the coin vanishes right before the eyes. A box with rubber bands around it is examined and then the bands are removed so that the box can be opened. What is inside? a smaller box wrapped in rubber bands.  This box also is examined, the rubber bands are removed to open this second box to see inside…..A small bag is found bound and sealed shut. The bag is opened and inside…beyond explanation the borrowed, signed coin is found! Incredible magic. Every jaw is on the floor and everyone is left looking at each other in total disbelief. How the heck?!