We can't say for sure. What we can say is that the just that died before Jesus's sacrifice went to "Abrahams Bosom". Moses, being just, would have been there most likely. Many believe that Hell is or was divided between the place or torment and the place of comfort, which was Abraham's Bosom.
I don't always agree with the Catechism of the Catholic Church, but I like how it words this subject
Scripture calls the abode of the dead, to which the dead Christ went down, “hell”— Sheol in Hebrew or Hades in Greek—because those who are there are deprived of the vision of God. Such is the case for all the dead, whether evil or righteous, while they await the redeemer: which does not mean that their lot is identical, as Jesus shows through the parable of the poor man Lazarus who was received into “Abraham’s bosom”: “It is precisely these holy souls, who awaited their Savior in Abraham’s bosom, whom Christ the Lord delivered when he descended into hell.” Jesus did not descend into hell to deliver the damned, nor to destroy the hell of damnation, but to free the just who had gone before him. (CCC 633)