Keep on looking for him! I've lost my gecko once when he was a baby like yours but the condition was much, much worse. My gecko was lost for over 6 months with no food or water, and he ended out finding me, alive. Never stop looking and keep ur door closed whenever you leave and keep the door crack blocked, too, so he can't get out and your chances get smaller of finding him. There is no way to lure him out with food, just keep on looking. Your gecko has to be somewhere!!!
Good luck,
Eclipse Crescent BlackWolf(me) and Sora-Faith Firekeeper BlackWolf(my gecko)