The mysterious, 1983 disappearance of a Vatican official’s teen daughter took another intriguing turn on Saturday with the discovery of a pair of “ossuaries” — small, box-like chambers containing remains of the dead — belonging to two 19th century German noblewomen.

The ossuaries will be opened for testing on July 20, Vatican authorities said, in hopes of determining whose remains are inside, the Catholic News Agency reported.

The discovery of the ossuaries belonging to a princess who died in 1836 and a duchess who died in 1840 is the latest twist as Vatican officials continue searching a centuries-old Teutonic cemetery in hopes of solving the disappearance of Emanuela Orlandi 36 years ago.

Each excavation and discovery is only deepening the mystery.

Emanuela, 15, was the daughter of a pontifical envoy and a citizen of the Vatican City State when she vanished.

Her disappearance — and speculation that the Vatican could have somehow played a role — has transfixed Italy in the ensuing decades.

The unsolved case was closed by investigators on 2016.

Then, on July 10, officials announced they would open two tombs in a cemetery on Vatican property as part of a revived investigation authorized by Emanuela’s family, the Catholic News Agency reported.

An anonymous tipster had told the family that the graves near a large statue of a pointing angel could contain clues to Emanuela’s fate, the news site reported.

The tombs in question belonged to a Princess Sophie von Hohenlohe and Dutchess Charlotte Frederica of Mecklenburg-Schwerin.

But when the two tombs were opened, they were found to be empty.

The noblewomen’s ossuaries, which should have been encased in the tombs, subsequently turned up under a hatch in the floor of Teutonic College, which is adjacent to the cemetery.

Both the college and its cemetery are on Vatican property.

The ossuaries will be opened in the presence of forensic experts, officials said.