Hello Jon and Gabriel. Since I am a bit behind in following your posts, I hope what I say will be clear to both of you. I have been reading a book called The Mass of the Early Christians
(
if it is written by Mike Aquilina I have read both volumes 1 and 2)
and from what I glean from my readings is that the Apostles truly believed the bread and wine was the body and blood of Christ. Now whether this was an early belief in Transubstantiation, or not, I have no way of knowing.
** It is true, from the early church father’s writings and teachings on the Mass and the Eucharist, Transubstantiation is never mentioned, although the faith is very present in their writings and teachings, especially when they are addressing heretics for their misunderstanding of the true presence, and the heretics rejection of the true presence.**
Later interpretation of these beliefs by the Catholic Church states the bread and wine actually becomes the body and blood of Christ. Transubstantation. It is one of the core doctrines of the Catholic Church. Hope this helps. God Bless.