The vault — which is rumored to contain enough music for decades of releases — was ordered to be opened last Tuesday by Bremer Bank, the court-ordered temporary guardian of Prince's estate.
The Minnesota music icon born Prince Rogers Nelson died suddenly last month at 57.
According to ABC News, only Prince knew the code for what is actually a walk-in safe located in the basement of his Paisley Park compound in Chanhassen, Minnesota. The contents of the safe reportedly date back to before the landmark 1984 Prince album/film Purple Rain.
"When I left in '87, it was nearly full. Row after row of everything we’d done. I can’t imagine what they’ve done since then," former Prince sound engineer Susan Rogers told the Guardian last year.
"One day, someone will release them," Prince said to The View in 2012 of the songs contained in his vault. "I don't know that I'll get to release them — there's just so many."
On Monday, a Carver County judge will begin determining which parties stand to inherit Prince's estate. It's estimated to be worth as much as $300 million. Prince's sister, Tyka Nelson, listed herself and five of Prince's half-siblings as potential heirs on the application to appoint Bremer as temporary administrator of the estate.