Lamb goes to see Savino to tell him about the dead security guard and the theft of the dental cement. "You're going to be buried in fakes before you know it."
Meanwhile, Jack has found a cluster of transactions of just under $2,000 that in sum add up to the amount Saffran owed -- good thing he just made enough to clear his debt and didn't add any for himself, hey -- and Mia realizes that since anything over $2,000 needs to be reported, he had some help with the cashier, who must have been in on it.
They head out on the casino floor, while a gaming supply guy trundles a crate of equipment in, the camera and music letting us know that something is up with this guy.
We watch the gaming-supply guy get let into the vault by the security guards, while Savino and Lamb discuss Savino's plan to switch out their chips entirely. Their realization that stealing that much dental cement could only mean Buddy would want a quick score soon before Savino switches the chips out, and so they spring to the safe, but they're too late. The guards are tied up and the safe has been robbed.
The guards start babbling as soon as their gags are removed. It must be stressful knowing that a screwup like this can cost you not only your job but your life. An angry Savino "wants hands" on the thief, but Ralph admits they have no idea who he is. That's when Jack shows up with the cashier in tow who helped Saffran get away with it.
Savino laughably tries to get Ralph to leave the cashier Holly there with him to question. I mean, Savino showed him Sullivan. While the Lambs shake the story out of Holly at the station, Savino conducts his own investigation.
Things rapidly spill out; Holly was a patient of Saffran's, and they both had debt so they figured this was a good way to clear it up. But Holly's boyfriend Jesse warned them it was only a matter of time before the casinos got wise to them, so they needed a big score. Saffran balked, and that's why he's dead now.