At the hotel, Shawn is able to listen in on Lassiter's briefing on the case. After the rehearsal dinner, members of the wedding party, including a drunk and stumbling best man, enter the safe room with the facilities manager, Dietrich Manheim, and place the ring inside the vault. Sensors indicate that neither the box nor the vault, which was on a time lock, was opened until the following morning. A video of the vault room confirms this. Since then, Dietrich Manheim has not shown up for work, and a review of his computer searches indicate that he was looking into buying a boat and making other major purchases.
By convincing a psychic-skeptical desk clerk that he is an Interpol agent working independently of the American police, Shawn is able to get unrestricted access to the front desk computers for a short time. He uses the opportunity to actually make keys for the rooms of all the suspects. With the keys, Shawn eliminates nearly all of the suspects and stumbles upon the wedding party where he finds out that Lacey has a wild side, the best man has been missing since the ring disappeared and that same night, the florist quit and everyone had to get together to hand make the bouquets. Actually, that's why Dylan figures his best man is missing -- he's lazy and didn't want to help with the flowers.
With their final key, they sneak into Lassiter's hotel room and go through the case files. They find out that the Attorney General has an insurance policy on the ring that will pay out only as long as it belongs to him -- which is until the wedding takes place.