Are undiscovered elements there? No.
We have discovered, or made (in however small quantities), all the elements up to 118. Any undiscovered elements beyond that will be very unstable and very short-lived. They will not occur naturally anywhere in the universe (except perhaps briefly in supernova explosions?).
There is no chance of discovering elsewhere elements that are stable but just don't happen to occur on earth. We have discovered all the stable elements on earth; the only ones that don't "occur naturally" are those, like Tc, Pm and the transuranics, that have no stable or long-lived isotopes.