Because we aren't Romans and they were never there to begin with.

The new testament which is addressed to us, Roman's to 2nd Thessalonians isn't missing any books. They are Pauls epistles to the church. We have Timothy through revelations for our learning and practice. it says in romans the old testament is for our learning its The story of the Christ line and it's preservation since Gen 3:15 until His birth then dome of his life and his resurrection. Also, I'm a Christian, I acknowledge no other lable.

Because we aren't Romans and they were never there to begin with.