In its first update, published around a month ago, ODAIT said it had found shoes, spectacles and baby glass bottles from the years the institution was operating.
The new report covers ODAIT’s work for the month up to the 24 September.
It says the team recovered further personal and medicinal items from what is categorised as the “institutional era”.
Excavators also found a window frame.
They have uncovered a pathway, two drains, and what they describe as an “underground vaulted structure” comprised of at least three chambers.
It is not the same structure where the remains were found in 2017.
ODAIT has previously indicated it does not expect to find children’s remains until a later stage in the excavation.