Break the Fake: Nick accidentally damages a samurai sword from a collection of Japanese artifacts, but discovers that it's a forgery because of what the damage reveals. The whole team then disassembles the entire collection, as it's all fake and taking it apart may provide evidence to explain the scam.
The Con: A casino security chief arranges a fake murder... which is a cover for the theft of a priceless antique... which is a cover for a heist from the casino's vault which is the cover for a massive insurance scam. While the mastermind doesn't get arrested, Grissom does give all his evidence (circumstantial at best) to the insurance company. Presumably, they require less proof to deny a claim.
Justice by Other Legal Means: While the mastermind doesn't get arrested, Grissom does gives all his evidence to the insurance company, figuring they will deny the claim.
