Known. A larger coffin had a smaller coffin inside it.
The burial room was under the tomb of Djefai-Hapy, at the Western Mount of Asyut. He was governor there in the reign of King Senusret I, about 1961 to 1915 BC. The burial is about 3,900 years old. It belongs to his daughter, Idi. The outer coffin was 2.62 metres long. The inner one was 2.30 metres long. Both carried writing about the journey after death. A box for special burial jars was there, and so were wooden figures. Much of the tomb had been robbed long ago.
The page does not say what is still argued.
https://www.ancient-origins.net/news-history-archaeology/djefai-hapy-tomb-0021517