Do you know if the Septuagint of the 1st century contained the Deutrocanical books?
In my research of this the earliest Greek manuscripts that include them date from only fourth century A.D. We don’t have a copy of the first century Septuagint to know what its canon was.
The New American Bible has these footnotes on the Apocryha books:The Books of Maccabees, though regarded by Jews and Protestants as apocryphal, i.e., not inspired Scripture, because **not contained in the Palestinian Canon or list of books drawn up at the end of the first century A.D., **have nevertheless always been accepted by the Catholic Church as inspired, on the basis of apostolic tradition.
The Books of Tobit, Judith, and 1 and 2 Maccabees, as well as parts of Esther, are called deuterocanonical: they are not contained in the Hebrew canon but have been accepted by the Catholic Church as canonical and inspired.
The Jews themselves did not accept them as being inspired.
Are there any direct quotes from the deuterocanonical books themsleves in the NT?
There were a number of tests the church used to determine this question. Was it wriiten by an apostle or one associated with one? Was it written by a prophet? Does it tell the truth about God? These would be some of the tests to determine inspiration.