They did mention him twice:
When Clarice & Esquivel were looking at the gum wrapper with writing inside, Esquivel said: "looks like Hebrew, where's Tripathi when you need him?".
Later, in the office, Esquivel asks Murray: "Did you here from Tripathi yet?", to which he replies: "He's out in Chicago, helping out his wife's parents" and Esquivel mentions that his wife passed.
The question of why Kal Penns seems to have taken a break, is of course still open.