There, he befriended Dixon and went on to help him with the exploration of the Great Pyramid, where they discovered the relics.
Following Grant’s death in 1895, his collections were bequeathed to the university while the “five inch piece of cedar” was donated by his daughter in 1946.
Neil Curtis, head of museums and special collections at the University of Aberdeen, said: “Finding the missing Dixon relic was a surprise but the carbon dating has also been quite a revelation.
“It is even older than we had imagined. This may be because the date relates to the age of the wood, maybe from the centre of a long-lived tree.
“Alternatively, it could be because of the rarity of trees in ancient Egypt, which meant that wood was scarce, treasured and recycled or cared for over many years.
“This discovery will certainly reignite interest in the Dixon relics and how they can shed light on the Great Pyramid.”
Priest and scribe Nesyamun has lay silent for 3,000 years, but researchers created a 3-D printed version of his vocal tract after the mummy’s remains were given a CT scan.