"We had hoped the testing would render different results," the museum said.
A hoard of scrolls, relics and other artifacts have been discovered in the ancient statue.
The ancient Mesopotamian artifacts trace back to a mysterious Sumerian City.
The video went viral on Thursday.
"This is sort of a dark archaeology, where we benefit from climate change that's making this ice melt."
This brings the total number of artifacts to 3,839.
"These are the runes we've been missing. We've waited generations to be able to dig into this."
The haul of items included gold coins, an ancient crown and a sword, uncovered during an investigation dubbed "Operation Zeus."
The artwork sheds new light on a crucial period in Japanese history.
The National Museum director said his department did nothing wrong.
The trade in stolen items has become increasingly important to the militant group as its oil revenues dwindle.
Law enforcement can use the nanotechnology to track artifacts, though some are skeptical the trafficking is as widespread as reported.
Archaeologists are excavating dwellings so well-preserved they include footprints and dishes with remnants of meals still inside.
A shipment of a few hundred small clay tablets from Iraq in 2011 might have been illegal.
The head of UNESCO has lambasted the desecration of historic and religious sites by ISIS, comparing them to the Nazis
Two "matching" towns from the Basketmaker period were discovered in neighboring sand dunes