The company has said no data was compromised in the breach, which saw the boy - who will be sentenced in September - access its mainframe from his home in Melbourne a number of times over a year.
Apple has since acknowledged the incident - which saw him download 90GB of secure files - and confirmed the steps it took by notifying the FBI, which then informed the Australian federal police.
In a statement, the company told the GUardian Australia: "At Apple, we vigilantly protect our networks and have dedicated teams of information security professionals that work to detect and respond to threats.
"In this case, our teams discovered the unauthorised access, contained it, and reported the incident to law enforcement.
"We regard the data security of our users as one of our greatest responsibilities and want to assure our customers that at no point during this incident was their personal data compromised."