Moses Finkelstein is the unseen owner of the Buy More chain of electronic stores, who has been mentioned on several different occasions.
He is first mentioned by Emmett Milbarge early in "Chuck Versus the Sensei", when Milbarge brings back "an old Buy More tradition" of Employee of the Month. The employee with the highest sale service would have the name and photo moralized on the wall next to the photo of the Buy More founder, Moses Finkelstein.
Moses appear again in "Chuck Versus the Ring: Part 2" when he phones Big Mike on his secret phone labelled "Moses" to warn Mike that the Burbank Buy More is at great risk of being closed due to poor management and not enough sales. This leads Mike, Lester and Jeff to plan a "Going Out of Business Sale" to try and raise the sales. It is unknown if he still owns the Burbank Buy More after the fire and the CIA takeover.
Although a common enough Jewish surname, it could (potentially) be a reference to the 'You Don't Have To Be Jewish' comedy album sketch in which a character explains that he's 'in women's underwear. You may have heard of us. "Filnkelstein and O'Brien Ltd." 'Finkelstein and O'Brien? That's unusual.' 'You think that's unusual? I'm O'Brien.'.