My impression from The Art of Glamour book is that Baker's family still has the art that was in Baker's possession at the time of his death. It doesn't appear that Baker had OA from his work at St John.
So, I would guess that not much of that OA has survived.
If you guys remember the Glamour book mention ones St John kid found out his father was screwing the assistant , he clean house and fire Matt and almost everyone else. I hope the KID didn't burn the OA.
That's the other thing that points to the destruction of St. John's OA, the son who fired everybody thinking they knew about Dad's infidelity. Matt didn't even know and he was still fired. Obviously the son was not thinking straight. The business was going bankrupt and he fires his best artist. Also no St. John's art by other artists seems to have shown up. Doesn't look good.