S3 Ep7: Postage Due

A one-of-a-kind postage stamp was being auctioned off. Although it had already been inspected, a bidder asked to inspect it himself. He looked it over and declared it a forgery. They presumed the real stamp was stolen and still in the room. The police were called in, and all present were frisked, but the rare stamp was never found.

The mystery: What happened to the stamp and how will the thief profit from it?