The 100 Saqqara coffins that archaeologists most recently found were buried in three 40-foot-deep burial shafts.
The sarcophagi were decorated with colorful, intricate hieroglyphics.
"Very rich, elite, high ranked people" owned these coffins, Waziri told NBC News.
Many of the Saqqara coffins were "well-gilded, well-painted, well-decorated," he said .
Saturday wasn't the first time that archaeologists publicly opened a coffin: Egyptian officials also opened one on stage in an October press conference.
Saturday's event was, however, was the first time researchers had X-rayed the mummy inside.
Archaeologists also unearthed more than 40 artifacts in the three shafts, according to Khaled El-Enany, Egypt's minister of tourism and antiquities.
These included gilded statues and funerary masks. El-Enany said the artifacts and coffins will be distributed to three museums in Cairo for display.
But the new artifacts are merely the most recent in a string of discoveries at Saqqara.
El-Enany announced in September that a set of 13 sarcophagi had been found at the bottom of a 36-foot-deep shaft.
He said on Twitter that finding that first coffin cache was "an indescribable feeling."
The shaft had three offshoots branching away from it, so El-Enany predicted at the time that more undiscovered sarcophagi were likely still buried in the shaft. He was right.
Two weeks later, the ministry announced that archaeologists had found 14 more sarcophagi. That brought the total to 27.
In a statement on Facebook, Egypt's Ministry of Tourism and Antiquities said the finding is "the largest number of coffins with one burial" discovered since a group of 30 coffins were unearthed at Al-Assasif cemetery in Luxor last year.
Archaeologists kept finding more sarcophagi in the weeks that followed. On October 3, Egypt's Ministry of Tourism and Antiquities announced the discovery of another 32 coffins.
That brought the total to 59.
Despite being buried for 2,500 years, most of the Saqqara sarcophagi have retained a lot of their original paint and hieroglyphics.
With the exception of the two opened by Egyptians officials, the coffins have been sealed since their burial.
The identities of the people inside the sarcophagi "have not been determined," the ministry said in September. But Waziri said the newly X-rayed mummy was likely someone wealthy.
The coffins were found stacked on top of each other in various burial shafts.
Archaeologists have uncovered various artifacts in each burial shaft they excavated.
In September, they uncovered a wooden obelisk just over a foot tall that's adorned with paintings of Egyptian gods and goddesses, CNN reported .
The ancient Egyptians buried their dead in Saqqara — which is 20 miles south of Cairo in the Western Desert — for some 3,000 years.
Saqqara was the necropolis, or city of the dead, for the ancient capital of Memphis. Its name likely derives from Sokar, the Memphite god of the dead.
Saqqara is home to one of Egypt's oldest pyramids: the Step Pyramid of Djoser, which was built about 4,600 years ago.
The architect Imhotep built the pyramid to house the remains of King Djoser, an ancient Egyptian pharaoh from the Third Dynasty.
It was the first building ever made of stone , and it paved the way for other pyramids, including the Great Pyramid of Giza.
The necropolis is replete with mummies.
Egypt's Ministry of Tourism and Antiquities announced in 2018 that archaeologists had discovered a 4,400-year-old tomb in Saqqara. It belonged to a royal purification priest who served during the reign of King Nefer-Ir-Ka-Re.
Researchers also unearthed a huge cache of animal mummies there in November 2019.
They found two rare mummified lion cubs , as well as mummified birds, crocodiles, cats, cobras, and an enormous mummified scarab beetle.
Ancient Egyptians mummified and buried millions of animals, often treating creatures like hawks, cats, and crocodiles with the same reverence that they would a human corpse.
The mummified lion cubs are about 2,600 years old.
The cubs were only eight months old when they were mummified. Other mummified wildcats were found alongside the two lions.
"This is the first time [a] complete mummy of a lion or lion cub" has been found in Egypt, according to Waziri.
The Egyptians believed animals were reincarnations of gods, so they honored them by mummifying the creatures and worshipping these animals in temples. Mummified animals could also serve as offerings to those gods.
Saqqara will likely yield even more discoveries in the coming months.
Another "promising discovery" from Saqqara will be announced soon, El-Enany told reporters on Saturday.
Via PakApNews